Disclaimer: The title of this topic is not true. Also, all the pictures were obviously stolen from the dojo.
How To Fight Meta Knight as Jigglypuff
This is Meta Knight. He is a completely broken character who is impossible to beat because he can win with only two moves. In fact, everyone has quit Brawl because he is so broken. In tournaments, no one plays as anyone except Meta Knight. If you play as someone besides Meta Knight, they will kick you out since serious players play only Meta Knight.
I read all these things on the Internet and therefore they are all completely true.
Mach Tornado
This is Meta Knight's Neutral B move. It is impossible to counter, avoid, escape, or punish, assuming of course that you are an idiot.
You are playing as Jigglypuff. You are in the air. (If you aren't in the air, all the time, you really are doing it wrong and need to play a different character or locate your nearest jump button.) Meta Knight's tornado is not a good move in the air; if Metaknight tries to neutral-B high in the air, you will avoid it (because you are playing as Jigglypuff) and you will punish your opponent for playing such a terrible Meta Knight.
So, tornadoes come at you from the ground instead of the sky, just like real life. Now, because Brawl is such a poorly designed game, there is a weakness to the tornado: The top of it has no priority. Since you are already in the air (because you are playing as Jigglypuff), you have a large number of options:
-Pound. Preferribly a falling pound into the top of the tornado. That would be very clever. It would also be stupid, because unless he runs into it, he will just laugh and suck you into it out of the long endling lag of Pound. Don't do this.
-Bair. Bair can occasionally work against the tornado. The keyword here is "occasionally. Don't do this either.
-Dair. Dair is an extremely reliable way to stop the tornado if you are directly above. Do this.
-Nair. Nair is amazing. Just dive in with a nair. Unless you do it from above you shouldn't hit Meta Knight, just stop to tornado. Try not to land in front of him or let him Shuttle Loop you.
Now... If you get caught in the tornado, Smash DI to the very top and Rest.
This is pretty much the best thing ever. If rest is not an option, get by with a dair.
Drill Rush
This is a decent, annoying move Meta Knight is fond of using against people shielding. As in, on the ground. So not you. (Because you are playing as Jigglypuff.) You would have no trouble avoiding it, and punishing after it is done is not too difficult.
Also, this:
I CAN HAZ PRIORITY?
Shuttle Loop
This move will kill you. Don't get hit. If Meta Knight is on the edge, don't attack him. It won't work.
After Meta Knight's Up-B, and sometimes just for kicks and giggles, Meta Knight will do this. This is the image of fear. The beast will do an instantly canceled glide attack with excellent KO power. If you try to shield it, he will grab you; if you try to dodge it, he will attack first. The obvious course of action is to quit Brawl because it is so broken.
Alternatively, you could just dair and laugh at the silly predictable Meta Knight. (Just like Fox and Falco!)
Dimensional Cape
If for some reason Meta Knight does this, you have a great chance to savor the large and long-lasting hitbox of Pound.
Ground Moves
-Meta Knight has a really fast repeating jab. Really fast repeating jabs are fun to Smash DI into and Rest. You will have to do it really fast if they have a brain though.
-Meta Knight has a good forward-tilt combo. Luckily, you should not be on the ground in front of Meta Knight. (Because you are playing as Jigglypuff.)
-Some Meta Knights are obsessed with doing down-tilts to move across the ground slowly. Against Jigglypuff, this is just inviting a free aerial.
-Meta Knight's up-tilt is good. It is fast and can kill you. Don't get hit.
-Meta Knights down-smash is really fast and will kill you. Feel free to bait it to get a dair or falling pound in, but be really careful.
-Meta Knight's forward and up-smashes are decent. Don't jump into them.
-Meta Knight has a respectable dash attack and a good grab game. His d-throw and u-throw do great damage, and his u-throw can KO at high percents.
-On stages with platforms, especially Battlefield, Kirby and Meta Knight's u-throw will launch from the highest platform above you, KOing at a lower percent.
-Don 't get grabbed.
Air Moves
Meta Knight's aerials are good. They are fast, have great range/priority, and are hard to punish. This is most of the matchup, right here. The key to understanding this fight is realizing that you have the aerials mobility to avoid Meta Knight's fairs and bairs, and space yourself to get a bair (or KOing fair) in of your own. It's difficult, but Jigglypuff is one of the few characters that is going to have a legit chance agianst Meta Knight in the air.
If Meta Knight is spamming nairs, any aerials should do with proper spacing. Do be careful to avoid them though.
Meta Knight's dair comes out really fast. Meta Knight is often easy to hit with a uair, but you need to do it while moving sideways out of the way of the dair. The uair isn't too bad, assuming you don't jump into it and let Meta Knight carry you to the ceiling.
How to Kill Meta Knight
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
Counter-picking Halberd against Meta Knight might not be a bad idea actually. Hmmm... I might go check some KO percentages later.
Conclusion
As you can see, it is impossible to fight Meta Knight. There are no recorded instances of anyone defeating Meta Knight with any character ever, much less Jigglypuff, who is the worst character in the game and has no redeeming qualities or viable options in any situation. Everyone should quit playing Brawl right now.
PROTIP: If anyone says "soft-ban" in this topic, I will Falcon Punch them. With Jigglypuff.
How To Fight Meta Knight as Jigglypuff

This is Meta Knight. He is a completely broken character who is impossible to beat because he can win with only two moves. In fact, everyone has quit Brawl because he is so broken. In tournaments, no one plays as anyone except Meta Knight. If you play as someone besides Meta Knight, they will kick you out since serious players play only Meta Knight.
I read all these things on the Internet and therefore they are all completely true.
Mach Tornado

This is Meta Knight's Neutral B move. It is impossible to counter, avoid, escape, or punish, assuming of course that you are an idiot.
You are playing as Jigglypuff. You are in the air. (If you aren't in the air, all the time, you really are doing it wrong and need to play a different character or locate your nearest jump button.) Meta Knight's tornado is not a good move in the air; if Metaknight tries to neutral-B high in the air, you will avoid it (because you are playing as Jigglypuff) and you will punish your opponent for playing such a terrible Meta Knight.
So, tornadoes come at you from the ground instead of the sky, just like real life. Now, because Brawl is such a poorly designed game, there is a weakness to the tornado: The top of it has no priority. Since you are already in the air (because you are playing as Jigglypuff), you have a large number of options:
-Pound. Preferribly a falling pound into the top of the tornado. That would be very clever. It would also be stupid, because unless he runs into it, he will just laugh and suck you into it out of the long endling lag of Pound. Don't do this.
-Bair. Bair can occasionally work against the tornado. The keyword here is "occasionally. Don't do this either.
-Dair. Dair is an extremely reliable way to stop the tornado if you are directly above. Do this.
-Nair. Nair is amazing. Just dive in with a nair. Unless you do it from above you shouldn't hit Meta Knight, just stop to tornado. Try not to land in front of him or let him Shuttle Loop you.
Now... If you get caught in the tornado, Smash DI to the very top and Rest.

This is pretty much the best thing ever. If rest is not an option, get by with a dair.
Drill Rush

This is a decent, annoying move Meta Knight is fond of using against people shielding. As in, on the ground. So not you. (Because you are playing as Jigglypuff.) You would have no trouble avoiding it, and punishing after it is done is not too difficult.
Also, this:

I CAN HAZ PRIORITY?
Shuttle Loop

This move will kill you. Don't get hit. If Meta Knight is on the edge, don't attack him. It won't work.

After Meta Knight's Up-B, and sometimes just for kicks and giggles, Meta Knight will do this. This is the image of fear. The beast will do an instantly canceled glide attack with excellent KO power. If you try to shield it, he will grab you; if you try to dodge it, he will attack first. The obvious course of action is to quit Brawl because it is so broken.
Alternatively, you could just dair and laugh at the silly predictable Meta Knight. (Just like Fox and Falco!)
Dimensional Cape

If for some reason Meta Knight does this, you have a great chance to savor the large and long-lasting hitbox of Pound.
Ground Moves

-Meta Knight has a really fast repeating jab. Really fast repeating jabs are fun to Smash DI into and Rest. You will have to do it really fast if they have a brain though.
-Meta Knight has a good forward-tilt combo. Luckily, you should not be on the ground in front of Meta Knight. (Because you are playing as Jigglypuff.)
-Some Meta Knights are obsessed with doing down-tilts to move across the ground slowly. Against Jigglypuff, this is just inviting a free aerial.
-Meta Knight's up-tilt is good. It is fast and can kill you. Don't get hit.
-Meta Knights down-smash is really fast and will kill you. Feel free to bait it to get a dair or falling pound in, but be really careful.
-Meta Knight's forward and up-smashes are decent. Don't jump into them.
-Meta Knight has a respectable dash attack and a good grab game. His d-throw and u-throw do great damage, and his u-throw can KO at high percents.
-On stages with platforms, especially Battlefield, Kirby and Meta Knight's u-throw will launch from the highest platform above you, KOing at a lower percent.
-Don 't get grabbed.
Air Moves

Meta Knight's aerials are good. They are fast, have great range/priority, and are hard to punish. This is most of the matchup, right here. The key to understanding this fight is realizing that you have the aerials mobility to avoid Meta Knight's fairs and bairs, and space yourself to get a bair (or KOing fair) in of your own. It's difficult, but Jigglypuff is one of the few characters that is going to have a legit chance agianst Meta Knight in the air.
If Meta Knight is spamming nairs, any aerials should do with proper spacing. Do be careful to avoid them though.
Meta Knight's dair comes out really fast. Meta Knight is often easy to hit with a uair, but you need to do it while moving sideways out of the way of the dair. The uair isn't too bad, assuming you don't jump into it and let Meta Knight carry you to the ceiling.
How to Kill Meta Knight
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
DRILLREST
Counter-picking Halberd against Meta Knight might not be a bad idea actually. Hmmm... I might go check some KO percentages later.
Conclusion
As you can see, it is impossible to fight Meta Knight. There are no recorded instances of anyone defeating Meta Knight with any character ever, much less Jigglypuff, who is the worst character in the game and has no redeeming qualities or viable options in any situation. Everyone should quit playing Brawl right now.
PROTIP: If anyone says "soft-ban" in this topic, I will Falcon Punch them. With Jigglypuff.