Playing the puzzles with your monster will help to raise its level.
You have to go shopping to raise your happiness
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Playing with your monster, taking it shopping, feeding it and decorating its room will help to raise your monsters health.
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By feeding your monster and buying it stuff! Also by playing regular
Playing with your monster and taking it shopping in Monstro City will help to raise his/her happiness. Also decorating your monsters room will help too. And not to forget, you can play games to help.
ASH
Try to do stuff that requires your current level.
45 Is currently the maximum level for PVM, They are hoping to raise the max level in the future.
Just repeatedly use defensive moves. To level it up faster, you could always fight a really strong enemy defensively.
You give him or her lots of food