1) You can go into the wild grass and battle wild Pokemon.
2) You can obtain the Vs. Seeker (But not in HG/SS).
3) You can find a route where you haven't battled any trainers and battle them.
4) You can find your rival and battle his/her Pokemon.
5) Leave your Pokemon in the Daycare Center and walk, run, or bike around.
*EDIT* 6) Mt. Silver
you can get a lv.17 pidgey by catching a pidgey and level it up to lv.17.
you level can level up your Pokemon by given it an luckey egg when betteling
Play games and fish or you randomly level up Hope it worked :)
sudowoodo when it knowmimic at level 17 and then level it up
get a shinx and level it up to 17.
keep taking it to the league
play games
buy better weapons and fight alot then you will level up quickly .
To level up quickly: your monster needs to be happy, add some more friends, play the daily challenge, buy about 3 bits of furniture or home decorations, and with the rest of the rox buy food for your monster. If you do all that every time you level up then you should level up quicker. If you want to know more ways of leveling up quickly, add me, I am: lissieloulaa.
By giving it lots of rare candy.
you level it up to level 16 or 17 then it will evole
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.