Here is the walking candy chart from PoGoHub
Let us all know who you plan to walk this week.
Larvitar - I only have 2 with bad IVs. I hope to catch a good one and/or gain a lot of candy since it's 5km.
I was already walking with my Larvitar, but everyone should just walk with what they need candies for (no change) unless you care more about EXP then Pidgey would make the most sense.