First of all, something is always gonna be objectively better in competitive, that is inevitable. That said, absolute numerical advantages are dumb.
>IVsRemove them.
>EVsWhat
>>51333390 said.
>NatureEven if you can change them, it is stupid that every single Garchomp is gonna be Adamant or Jolly, when those are supposed to be unique traits to each pokemon.
I would make them:
Adamant - Powers Up Phys Moves 5%
Serious - Powers Up Special Moves 5%
Hardy - Resists Phys Moves 5%
Quiet - Resists Special Moves 5%
Lax - Can shrug off Paralysis (1/4 chance)
Calm - Can shrug off Poison/Burn (1/4 chance)
Hasty - Wakes up 1st turn after being put to sleep/being frozen
Bold - Pwr-Up Normal 10%, Resist Normal 5%
Brave - Pwr-Up Fire 10%, Resist Water 5%
Careful - Pwr-Up Water 10%, Resist Electric 5%
Docile - Pwr-Up Grass 10%, Resist Fire 5%
Gentle - Pwr-Up Ice 10%, Resist Rock 5%
Quirky - Pwr-Up Electric 10%, Resist Ground 5%
Impish - Pwr-Up Dark 10%, Resist Bug 5%
Jolly - Pwr-Up Flying 10%, Resist Ice 5%
Lonely - Pwr-Up Psychic 10%, Resist Ghost 5%
Mild - Pwr-Up Bug 10%, Resist Flying 5%
Modest - Pwr-Up Fighting 10%, Resist Fairy 5%
Naive - Pwr-Up Fairy 10%, Resist Poison 5%
Naughty - Pwr-Up Ghost 10%, Resist Dark 5%
Rash - Pwr-Up Rock 10%, Resist Steel 5%
Relaxed - Pwr-Up Ground 10%, Resist Grass 5%
Sassy - Pwr-Up Poison 10%, Resist Psychic 5%
Timid - Pwr-Up Steel 10%, Resist Fighting 5%
Bashful - Pwr-Up Dragon 10%, Resist Dragon 5%
