Make an online account for GameSpy, then join a server hosted by a really high level player. (Preferably a general Knoxx server) then wait behind. the high leveler will kill all enemies and you will collect all exp. You will level up atleast once per kill.
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Play games and fish or you randomly level up Hope it worked :)
the easiest way to level up your Pokemon to put it in daycare Pokemon will level up soon.Trade the Pokemon to friend and have it hold a lucky egg it will level up quickly.
Find any double battlers in the region and have aron hold exp share send out aron and a really strong Pokemon beat the trainers and aron will level up quickly repeat until it evolves.
You have to get an eevee then make it really really happy then level it up during the day. If you level it up during the night, it will become an umbreon. p.s. its spelled espeon
You have to keep taking your Pokemon into battles and level him up. Harder areas will give you more experience and level him up faster. It's worth it, really. Level 100 Pokemon are really strong and nice to have around to help you with the game.