Which pokemon that you consider trash would you improve and how? This can be done by improving move pool by 3-4 moves, EV's by 20 at most, signature moves, typing if applicable etc. This can be done for doubles or singles as they are extremely different metas and such. As an example

Throh

increase spdef and def by 10 each (85-95 stat total 465->485)

storm throw -> 60 -> 70 maybe 80 as it's a signature move for this pokemon only meaning it cant be totally abused
drain punch to move pool (same with sawk)
mach punch
submission

also why does this pokemon know matblock, it isn't a priority move and it's slow as shit what's the use of it on this pokemon unless trick room is up?