>>48118671Cotton Guard / Leaf Tornado
Hang out in the back line and pepper enemies while healing your teammates. Tornado provides a speed boost which you can use to chase people down or help your team (or yourself) escape. It also speeds up rotom and can snipe objectives. The tornado's hitbox lingers a little bit at the very end and can hit people twice, and upon upgrade, it drops accuracy which can help you evade moves even if they land. It's a really good move.
Goss' offense is surprisingly capable, you don't deal much damage, but you can outlast regular DPS characters if you're smart with healing, don't take 1v1s, obviously, but you can at least defend yourself. For items, you want Muscle Band and Buddy Barrier, then your choice between Score Shield or Focus Sash depending on how much you plan on going on.