Sure.
First and foremost, it's all about getting in the quick grabs. If someone gets a grab, just throw towards the teammate.
If I grab, I will most likely fthrow or bthrow to you. These combo into any of DK's aerials or smashes. Dsmash is easiest if you don't want to worry about timing.
If DK grabs and you aren't doing dthrow to ftilt or something, I'll be looking for the cargo dthrow into any of my smashes. These can happen pretty quickly.
At low percents, it may be wiser to use DK's bair or dair for combo potential since smashes won't exactly kill yet.
Both characters are capable of tanking or going on the offensive if need be. It will be easier just to communicate when to do this. Ike can pretty much just space aerials pretty safely.
Also, if I'm jabbing someone, feel free to come near for a follow up since the opponent will only be trying to SDIing away.
Our biggest weakness is double MK, but it is possible if we get those grabs and early kills.
Our next biggest weakness is getting double teamed because we both lack projectiles and have to chase to the other side of the stage. DK has aerial upB as a gtfo move, but Ike can really only jump away and do aerials.
Ike and DK share many of the same stages that we like.
BF: we can utilize our range to cover pretty much the entire stage, mostly through DK bair and Ike's aerials. If opponents are on the platforms, use powerful attacks and aerials to cause an edge slip, and that follows up to other attacks.
PS1: Pretty decent. We both have good wall infinites on most characters
Lylat: Same as BF
Obviously YI is great for DK and Ike is okay here but it will probably be striked first from other teams, . SV is just okay for us here, too, nothing special imo.
CPs:
Ike is great on Delfino and Brinstar, and he is decent on all of the other CPs. Halberd may be a pocket CP for us just for the low kill %s.
For stages I don't like, I'm not a fan of FD, but it could work depending on the opponents. Other than that, I'm usually good. I usually ban rainbow because it's difficult to keep track of 4 players on such a small stage.