I. Olimar's Role In Doubles
Basically an over view of how he can be played, recovery kinks, things you do/ should be doing with him in general
I personally feel olimar is the person who should be sitting back camping, saving his moves for the final hit. He makes an awesome partner to combo with, he is really good at camping, and can kill quickly.
II. Strategies
There are things that work in singles that may not work "too well" or as "effectively in doubles as they normally would, so here goes what works in doubles in general
Spamming your sideb is NOT RECOMMENDED for doubles whatsoever. You do this and you also kill your partner, if you are goign to sideb make sure you are really accurate, your partner isn't there, or you are sniping a white or something. I used to try to camp a lot and i would just end up racking up damage on my partner most of the time.
Look for team combos! This is good for anyone, if someone is off the stage make sure you go right to your partner and one of you grab and the other does whatever while your enemy is still spawning. Olimar is a great combo player, and taking advantage of these situations is very important in any time.
III. Teammates
I think this is one of the most important factors in Olimar doubles because I've noticed depending on your partner's character you are going to play more of a certain way, than you would if they played with a different character. Also we can rank(sort of like a tier list) where character "A." stands with Olimar as a doubles partner.
This....is the hard part. Nearly everyone in the game makes a difficult partner for olimar. This game is more about teamwork and acknowledging your partner and relying on him. You need to make sure he saves you from getting gimped, saves you AFTER you get gimped (like metaknight with his upair), and to just make sure you don't get knocked the hell around.
Top choices I would prefer....
1) Metaknight -- MK is just amazing, he is quick, strong, can kill, and his ABILITY TO SAVE YOU FROM BEING GIMPED is just ********. I haven't been gimped when I had a good MK partner, he always drops down and uairs me so I live. Make sure your partner is well aware of any problematic situation.
2) Marth -- Marth is a VERY quick killer, he is very mobile and has great spacing tools. Let him do all the work for you and you just go in for the team combo or the kill moves. Don't let your partner get beaten around too much though ^_^ Your role in this is to stock tank
3) Lucas -- Don't really have much to say about this, but for some reason every Lucas I team with, regardless of skill level, makes a really awesome partner for me. Maybe someone can explain this? :o
4) Yoshi -- My partner is Green Ace, so maybe it's just my situation. We both play aggressive camping in this matchup, preferable on the same side of the stage with the enemies away from us. I just spam grab and he throws eggs past us, which creates an almost impassable wall. As long as you and your partner understand each others playstyles almost anything is possible.
:::I WOULD STAY AWAY FROM:::
1) Snake -- As current snake metagame evolves, a lot of it has to do with his grenades. This leads to most snake players using grenades way too much, especially for doubles. Every time I team with a snake I'm getting hit by explosions, their C4, just about anything he does. This is a very possible team and can go a long way, as long as both players understand it's doubles, and that you both are ready to watch out for random explosions. Snake and olimar make great team combos as far as grab kills, double teaming, and can both fend for themselves if it turns into a 1on1 situation. Just make sure you and your partner understand each other and communicate! If you do have a snake partner, when 2on1, snake dthrows and tech chases normal get up and away, you just stand there and charge a dsmash it's amazing xD
Snake I still do decently with, but it's very difficult. Other than that, there isn't really any "bad" teammates I can think of at the moment :X
IV. Stages???
I'm not too sure if this would work or actually be discussed very thoroughly. But if people feel the need to say Olimar in doubles works well on such and such stage then this will become a section.
I personally feel every large stage (halberd, final destination, jungle japes, lylat, etc.) works VERY well for olimar in doubles. He's able to run around like he can in singles without the risk of falling into friendly fire from your partner. The closer everyone is together, the more hectic it gets. You can split apart your enemies pretty easily and can be careful not to get gimped because there is more space to move around.
***FINAL NOTES***
I love playing as olimar in doubles. The biggest point I'de like to make is that you and your partner MUST COMMUNICATE! Communication is the biggest thing, especially having olimar as a partner. Every time you are off the stage, or think you are gonna get knocked off, inform your partner. Getting gimped in doubles is very easy and can happen very unexpectedly. Don't try to pikmin spam, try to be accurate if you are using sideb and not to latch onto your partner. The only time I can consider latching onto a partner is to activate a counter-ability; lucario marth and ike, which can be very deadly if you communicate nicely.