2 questions

Well the answer to your first question is simple. It's impossible without hacking the game codes/sprites. And that's sorta....wrong. But if you want one that bad get the VisualBoyAdvance, Hacking Programs and hack the buterfree sprite on your comp to make it pink. Lol.

And the answer to your second question is..either Level up with or without EV training (I've never tried it but I know it's very useful.) Go find a guide to EV training. There's a gudie to that on Serebii.net. And other sites too so get reading, lol ^.^ Basically, in short, you need to start of with the Pokemon you wanna be EV trained, give it 10 irons then start EV training on the Pokemon that give 3 points. Also give it the Macho Brace and try and have PokeRus =D. Check sites for more info.

Hope this helps! =D

Well you can't because the shiny Butterfree is purple with pink wings so that is as close as it is going to get.

Train your pokemon.

:( :( :( :( :( :( :( :( :( :( :( :( :( :( :(
Attack of the frowny faces.

1. Well a pink butterfree is a shiny Pokemon and the chances of catching a shiny are like a thousand to one, but if you have an action replay catching it won't be a problem just look at the AR codes for Pokemon pearl.
2. Well the best way to raise HP and Defense is too level up, level up, and level up.
So good luck. And happy gaming.

Well to answer your first question, you can normally get a Pink Butterfree through cheating. Using programs such as PokeSAV. Another way to get the pink Butterfree is by looking really hard around the entire game to find one. Simpler is to get someone to trade it to you, or look for it in the GTS. To answer your second question, you will normally need to use Hp Up and Iron to raise them. You can also try leveling up your Pokemon up to level one hundred. Another way is by becoming good friends with your Pokemon, or something like that, and continue with your training. Doing these methods will help you level up your Pokemon's skill levels (or EV's). Oh, and another way you can level them up is by using PokeSAV to make a whole new one, but with higher stats than normal, but it's mostly considered cheating so I would recommend that you don't use PokeSAV at all. For items only.

Pink Butterfree is the shiny version of a regular coloured Butterfree.

For your second question, if you know about EVs, train on Pok�mon who give EVs in HP and Defense, you should see an improvement on those stats.

First off if you want a pink butterfree then find a shiny one. But the odds of finding a shiny Pokemon is about 49,000,000 to 1. Second if you want to raise the health points (HP) and defense just level your Pokemon up.