BW/BW2 Shiny Sewaddle on Pokemon White - Do I evolve?

[Vortex]

I caught a shiny Sewaddle yesterday on my Pokemon White in Pinwheel Forest, and it's my first shiny if you don't include Pokemon Rumble shinies.

My problem is this: do I evolve it into a Leavanny and make it usable or keep it as a Sewaddle as a collector's item rather than part of my team? I've put a poll above, and any further comments you would like to put can be posted below.

Thanks, I appreciate your time and opinions,
P0KEVORTEX
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[PMJ]

This cannot possibly generate good discussion. Like it means anything less if it's evolved. Leave it as a Sewaddle and if you decide to use it later, evolve it then.