If you have a low level pokémon, give it an EXP Share to hold, which you get from one of Professor Oak's Aides when you have 50 pokémon caught/evolved in your pokédex. Then go and defeat the Elite Four with other stronger pokémon in your party.
exp. share
cheats or good Pokemon like all level 100s
If it's lower than level 35, you should be able to just use an ultra ball at full health. You have to use it on the first turn, though.
i think there are some weapons that can help you lvl up quikly, but idk hope this helps.
You can level up by playing puzzles with your monster, at the Puzzle Palace. You should do the practice puzzles as often as you can and also do the Daily Challenge daily.
if membe /join backstage if non mem pvp-gate way to milltnouis
In the game you have to battle alot of Pokemon till your Pokemon level up.On a pokewalker a hundred steps is a level up,but your Pokemon can olny level up one.
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.
You can feed it buy it stuff and to level up really fast until you reach up to level 8 or so play the daily challenge every day. this still works if you are on a really high level but it doesn't fill the meter up as much.
just battle against other Pokemon to level up
Train your pokemon.
you level can level up your Pokemon by given it an luckey egg when betteling