Raikou,Zapdos, and who else?
I am starting to prepare for Suicuine and have been fortunate enough to have 3 good Raikou and Zapdos would Dragonite or Exxeguttor be better or maybe both? Also have a good Venusaur but at 2300 cp vs.2600 Eggy or 3100 Dnite? Idk.....
Answers
If you are enough players just go with your 6 Legendaries. If not I'd use Dragonite and Eggy as tank. Venusaur is not that good because Suicuine might have Extrasensory as Quick Move.
We have Suicuine here in Europe and he is tuff. You should be at least 6 people lvl35+
PS: he sucks. I'd try to convince your friends to do Tyranitar raids instead as soon as you have one for the Pokédex
I like the extra xp from Tier 5 and a little better rewards as I have just under 1m for Level 40, we have a hard core group that has done Raikou with 5 and Entei with 4 but thinking this is gonna be a 6 person so in my small town won't be a ton of chances anyway. I have managed around 100 of the first 2 beasts but I have about an 80% catch rate.
Aside from the electrics, Eggy with Solar Beam is probably best despite the lower CP (gotta love that 302 damage with STAB and SE), then Dragonite. Dragonite does pretty well against most flavors of hidden power (save ice, of course). If you know the quick attack, you can plan for it. Just make sure to bring some water resistance.