What should i do about this Zelgius

Not the best IVs, but still usable. Although the HP boon gives him more Panic Ploy potential. If you don't have any expensive skills available like Steady Breath, Bold Fighter/Vengeful Fighter, etc. just go for his base kit. His support skill can be Swap, and Seal could be Close / Distant Def

If no one answered your question, what would of you done to your Zelgius?

In other cases I would go with his base kit as it's really unpredictable when near allies in a team, when using Warp Powder. Now because of the +Hp boon, Panic Ploy will now be even more effective. The Offensive option is expensive and SB is great on Zelgius, pair that with QR and he will defeat enemies in the Enemy Phase.

I had a similar situation,I was using bK for awhile I even merged him up to +2 and then one day I got a +atk -res zelgius,I was conflicted,but seeing as bk still was better except in atk I continued to use him.Then I was pitybroken by him again.....I merged him and told myself if he gets to +3 Im sorry BK,but I will have to replace you lol.

So I get pitybroken again while summoning for some red unit I forgot who exactly,now I'm like damn really now he is +2,BK in the hot seat now lol.

The stance banner dropped,so I'm not planning on summoning at all just the free summon,so I'm like f-ck it lets go red I'm not getting him anyway,but damn it was zelgius with +spd -hp ivs,so I scroll to edit teams and say my goodbyes lol.

Long story short zelgius is damn good even if you have BK you should train him up.