Experience is the best way, just get used to being serene at all times, this goes for life outside of Pokemon as well.
Remember that annoyers are almost always worse than a different pokemon, so it's an opportunity cost for your opponent. It may be lot of fun to parahax things with jirachi, have fun getting wrecked by anything with a lum berry or inner focus (I'm looking at you Lucario).
Jirachi has a lot of versatility, but it isn't the best at anything it does and it doesn't have enough utility (in most cases) to make an significant impact in a match between two competent players.
As for Gliscor it basically loses to anything that isn't hit by EQ, so... Latios comes in for free and fires of LO surfs and Draco Meteors, unless you have Tyranitar/ Chansey you're losing a pokemon. Gliscor isn't really an annoyer anyway.
The pranksters are generally frail and all of them are easily handled, Sableye by fire types, Whimsicott by grass types. Though most teams run neither of those types, both can also be managed by strong priority moves or Toxic Spikes.
Remember that annoyers are almost always worse than a different pokemon, so it's an opportunity cost for your opponent. It may be lot of fun to parahax things with jirachi, have fun getting wrecked by anything with a lum berry or inner focus (I'm looking at you Lucario).
Jirachi has a lot of versatility, but it isn't the best at anything it does and it doesn't have enough utility (in most cases) to make an significant impact in a match between two competent players.
As for Gliscor it basically loses to anything that isn't hit by EQ, so... Latios comes in for free and fires of LO surfs and Draco Meteors, unless you have Tyranitar/ Chansey you're losing a pokemon. Gliscor isn't really an annoyer anyway.
The pranksters are generally frail and all of them are easily handled, Sableye by fire types, Whimsicott by grass types. Though most teams run neither of those types, both can also be managed by strong priority moves or Toxic Spikes.

