The pokémon with the fewest total base stats
Sunkern (180)
A third-stage pokémon that can be obtained at the lowest level
Porygon-Z (trade a hatched Porygon), Roserade (breed roselia without incense and use the stone)
The only pokémon that can have both Vital Spirit and Insomnia
Delibird (it makes the pokemon's ability/hidden ability useless)
The lightest pokémon (three possible answers)
Gastly / Haunter / Flabébé (0.2lbs - 0.1kg)
The only mono-type pokémon that can learn Acupressure
Maractus
The only pokémon that gain STAB with Explosion (excluding Smeargle)
Lickilicky
The largest pokémon
wailord
The Dark type move with the highest base power
Fling with Iron Ball (130)
The base pokémon with most resistances and immunities
Magnemite (12: immune to Poison, resistant to Normal, Flying, Rock, Bug, Steel, Grass, Electric, Psychic, Ice, Dragon, Fairy)
The move known by fewest pokémon (excluding Sketch)
Chatter
The smallest pokémon (two possible answers)
Joltik / Flabébé (0'04'', 0.1m)
The first pokémon (in pokédex order) whose name contains another pokémon name
Pidgeotto
The minimum level at which Gallade is obtainable
6
The only non-Ice-type pokémon used by Lorelei
Slowbro
The wild pokémon that can be found at the highest level
Magikarp (100)
The legendary pokémon that doesn't learn Protection
Regigigas
The very first pokemon having a 4x poison weakness
Paras (in gen 1 poison was supereffective vs bug)
The only fire pokémon that learn Powder Snow
Castform (Sunny Form)
The first legendary Kalos-born pokemon obtenaible in its shiny form (in temporal order from XY release)
Phione
The pokémon that gains most weaknesses upon evolution
Eevee (evolving to Leafeon: gains Fire, Flying, Bug, Ice, Poison)
The minimum number of enemy wild pokémon needed to know the type of Hidden Power (not taking in account Protean/Color Change)
3
Besides Shedinja, the pokémon with the fewest base HP
Diglett (10)
The only non-legendary genderless pokémon that can learn Attract
Cryogonal
How many different not fully evolved pokémon (in their respective generation) you can find fighting the Elite Four
7 (I gen: Haunter, Dragonair; II gen: Onix; III gen: Sealeo, Shelgon, Golbat; IV gen: Murkrow)
God
Emotion
Willpower
Knowledge
Which pokemon do these 4 word represent?
Arceus
Mesprit
Azelf
Uxie