I've been using +5 immty and zammy, but I've been losing to prof Gak/Booboo teams. (I think people are just using prof gak, cause he easier to fuse than the other tanks)

I can't burst down targets fast enough before booboo heals them back to full. And you can't kill booboo first, because he doesn't have the weakness other healers have. Low HP. Booboo literally has the HP of a tank.

I think prof oak can be subbed for immyt, because if you do encounter non common teams, it's and your 1 SP targeted skill will work in bursting someone down (Along with your targeted skill)

I feel booboo (non fused) is the one carrying the team atm. Zammy is useless versus a common team, because usually, a player will put themselves in the middle, and you can't target him/her with zammy.