100% catch/flee rate?

[TheMikningBolt]

On the first few routes in Pokémon, they are rigged so you can auto run away and auto catch. It REALLY bugs me in my game I can't catch a level 3 Lillipup on the first route even after lowering it's HP. I noticed a command like this:

Events.onWildPokemonCreate+=proc {|sender,e|
pokemon=e[0]
if $game_switches[31]
pokemon.makeShiny
end
}

Can you do this for the catch rate and flee rate? I can't find it on the wiki.

Thanks!
Mike.

(P.S. I know someone's gonna say "It shouldn't be modified" but trust me, my level 7 Sewaddle cannot die from a level 3 starly by spamming run. It really ticks me off, and I want to learn how to do it.)