It really depends on your community, anonymous. Some communities require pet pokémon to be on leashes in addition to their poké balls; others will trust you with a poké ball only. It may be an excellent idea to consult your community’s website or your city or town council to find out the specific ordinances in your location.
When walking rockruff do I need to use a leash or will its pokeball be enough if it tries to run off
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The Pokédex According to Bill 