well u could train alot or
you can give them a lot of rare candies
keep battling Pokemon and people
you must be a very patient person :) THERE IS NO EASY WAY :(
there is no easy way celebi evolves at 200
Dont get him
well just level it up, that's basically it
Get a pokeball.......
There is an easy way to get your Pokemon to a certain level. All you need to do is collect rare candy and use it on the Pokemon you want to level. This will automatically level up your Pokemon.
Train it.
if your Pokemon are on a high enough level, every weekend you can battle you rival
beat the ealeat 4 100 times or fite Pokemon were you catch dialga 10000 times both are hard never use cheats or your game will crash
You have to keep battling to increase your EXP. points or use Rare Candys