Let one of your fave boxed pokemon hold your Masterball to avoid using it

I recently got the masterball! But how close it's to your ultraballs is pretty scary! Before I got it I would accidentally use my premier balls when I meant to use ultraballs.

I made my shiny mareep hold it since I know I'll keep it boxed and safe.

I can take it out when I deaggro a shalpha or when I don't get too close to a timid pokemon.