A Pokemon with full EVs will always have the same strength at a given level, no matter whether it is 'really' that level or has been auto-levelled (down or up) to it.
So if you plan on playing battles with auto-levelling, there is absolutely no need to level up beyond what you need to learn your moves. (Indeed, it's better to hold off level 100 so you can change your EVs if you want).
So if you plan on playing battles with auto-levelling, there is absolutely no need to level up beyond what you need to learn your moves. (Indeed, it's better to hold off level 100 so you can change your EVs if you want).