get a Pokemon that knows helping hand and use it with the shadow Pokemon in a battle.get the shadow Pokemon to use shadow rush and the other Pokemon to use helping hand, the shadow Pokemon should go straight into shadow something during that turn or the next (depending on where the Pokemon is positioned), Call it and it should snap out, repeat this till it is ready to be purified.That is the quickest way I know.
You can breed Pokemon quicker by having Pokemon with different ID's (check by clicking on your Pokemon's summary).
Well yes pichu can and other type of Pokemon
By taking your strongest Pokemon to battle.It will get you through the collasium quicker.
by cheating and cloning rare candies. but that makes you a cheater, and your Pokemon will hate you.
by using the sprayduck or waiting
yes. all you need to do is use a few rare candies.
2 Words: Action Replay
Have a Pokemon with the ability Flame Body or Magma Armor
have a magmar or magmotar in your team next to the egg
do lots of trainer battles but make sure your Finneon is first in your party. do lots of trainer battles and as soon as you battle them switch to a tougher Pokemon and make it beat the trainers Pokemon your Finneon and tougher Pokemon will both get lots of exp which will level it up quicker and evolve it quicker it'll help if your tougher Pokemon and Finneon is holding an exp share hope this helped!
The easiest way to get Phanpy is to migrate from Pokemon emerald or ruby :D
2009 Easter norwhich regigigas or shaymin arceus comes out in 2010 (or cheat its quicker)