>>30722841EVs and IVs can be fixed.
Nature however. Cannot. It's both the easiest to decide and the most influential to your Pokemon.
As you see in this picture. His attack and speed suck.
You'd want one that's +def +sp def or +sp atk - atk
His attack is the most useless.
You can synchronize a modest one or breed it. It's really going to make him a killer regardless. With 252 hp 252 sp atk .
Just get a modest one and have him carry.