Answer 1

Each species of Pokémon has a catch rate that applies to all its members. Higher catch rates mean that the Pokémon is easier to catch, up to a maximum of 255. When a Poké Ball is thrown at a wild Pokémon, the game uses that Pokémon's catch rate in a formula to determine the chances of catching that Pokémon. The formula also takes into account the Pokémon's current health, any status effect it may have, and the type of Ball being used.

Source

Pokemon with 255:

• Caterpie
• Weedle
• Pidgey
• Rattata
• Spearow
• Ekans
• Sandshrew
• Zubat
• Oddish
• Diglett
• Meowth
• Poliwag
• Bellsprout
• Geodude
• Magikarp
• Sentret
• Hoothoot
• Ledyba
• Spinarak
• Hoppip
• Wooper
• Poochyena
• Zigzagoon
• Wurmple
• Lotad
• Seedot
• Shroomish
• Slakoth
• Nincada
• Nosepass
• Skitty
• Numel
• Spoink
• Spinda
• Trapinch
• Swablu
• Baltoy
• Feebas
• Spheal
• Clamperl
• Starly
• Bidoof
• Kricketot
• Budew
• Bronzor
• Bonsly
• Patrat
• Watchog
• Lillipup
• Purrloin
• Pidove
• Roggenrola
• Audino
• Tympole
• Sewaddle
• Venipede
• Maractus
• Minccino
• Vanillite
• Ferroseed
• Elgyem

Source

Comments

err after the edit it looks like i just edited to out beat you, ill upvote

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Kyron has such great sportsmanship lol

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Of course, contrary to popular belief im not a douche-bag

Answer 2

its a tie with 255 between:
Caterpie
Weedle
Pidgey
Rattata
Spearow
Ekans
Sandshrew
Zubat
Oddish
Diglett
Meowth
Poliwag
Bellsprout
Geodude
Magikarp
Sentret
Hoothoot
Ledyba
Spinarak
Hoppip
Wooper
Poochyena
Zigzagoon
Wurmple
Lotad
Seedot
Shroomish
Slakoth
Nincads
Nosepass
Skitty
Numel
Spoink
Spinda
Trapinch
Swablu
Baltoy
Feebas
Spheal
Clamperl
Starly
Bidoof
Kricketot
Budew
Bronzor
Bonsly
Patrat
Watchog
Lillipup
Purrloin
Pidove
Roggenrola
Audino
Tympole
Sewaddle
Venipede
Maractus
Minccino
Vanillite
Ferroseed
Elgyem

Source

Comments

OMG. That's A LOT of Pokemon!