⬥ Pokemon can gain 5 levels with each bonus, up to a maximum of 10 levels (2 bonuses) per calendar month.
Other options:
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Is this per pokemon (1) or per character in a single month (2)? Examples below as to what each refer to:
1) Pokemon A gains 5 levels, Pokemon B gains 10 levels
or
2) Pokemon A gains 5 levels, Pokemon B gains 5 levels