What happens if Kecleon with "Color Change" and Wobbuffet with "Bide Barricade" end up as Active Pokemon opposite each other? Does Kecleon change to Psychic, or does Wobbuffet shut off its power and Kecleon stays Colorless?
If Kecleon starts out as Psychic and then Wobbuffet becomes Active, Kecleon stays Psychic. But if Wobbuffet is Active first, or if they both become Active at the same time (including as the starting Pokemon), then Kecleon stays Colorless.
Source: TPCi Rules Team (2014-12-04)

Relevant cards

Note: All applicable cards may not be listed below.
BW9_94
XY4_36