first you have to get the gown then you attack hollows and hollows only and that is how you level the gown up.
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By training your Pokemon.
First, It's ''Camelot'' not Chamelot...Second, You can level up by building your cities, attacking wildernesses and training troops.
Simply don't train it at all. Training a Pokemon is what causes it to level up.
Unfortunately the only area for good training is the Pokemon league.
Train it up to level 40. It is a high level but there's a hint for training Pokemon in my answer to this question: How do you get EXP all in Pokemon SapphireAnswerRhyhorn evolves into Rhydon when it reaches level 42.