My friend and I have tried out a few teams. We won a tournament with Donkey Kong and Captain Falcon as our only team, and it seemed to work as DK dealt out all the power moves and survived forever, and managed to keep the opponent from capitalizing on many of Falcon's worse traits. Falcon himself played a wicked harassment game and didn't have to worry about creating as many openings himself in the 2v2 environment.
Another team we tried recently was DK and Ike, which works surprisingly well, especially if DK relies on tilts and looking out for Ike, who has way more opportunities to throw around his own power moves. DK makes it hard for opponents to gimp Ike, allowing them both to survive longer.
That being said, I like doubles because I think it relies less on character picks; there are almost endless combinations that can destroy, and it opens up the tier list tremendously. Thus, player strategy is that much more important.
Here's how we operate:
- We have 2 rules: NEVER hit your team-mate, and helping your team-mate is more important than attacking the opponent.
- Communicate with your team-mate. I noticed at the tournament we were the only two talking to each other. It's as simple as complimenting each other's moves and asking how he's doing if you're busy and you can't watch him. We also apologize to each other when friendly fire occurs (that's probably just us, haha). This also has the effect of keeping us cool and stress-free in a fight.
- Do not be afraid to call out your moves, call for help, or anything else that you think might give away what you're doing to the opponent. Just because the opponent knows what you're trying to do doesn't mean they can prevent you from doing it. I'll straight up tell my mate that I'm going for a grab, or hanging back or going for a kill. Certainly, most of the time we have a hard time executing the moves we call, but more often than not the enemy is placed in a stressful situation trying to counter your plans, and we are almost never placed at a disadvantage. BOTTOM LINE: The advantage of your team-mate knowing what you're up to is far greater than the disadvantage of your opponents knowing. This is especially important when it comes down to the 2v1, where rushing in could end up killing you, despite your supposed advantage.
Sorry for the wall of text.
TL;DR Version:
DK+CF Rules if you ask me.
- Don't hit your team-mate.
- Survival and communication are your greatest assets.