Chromie-Time Zoned wild pet battles give no character xp if above pre chromie-time patch level for the zone. For example a lvl 37 character chromie timed to TBC gets no character xp for the wild pet battles (but I level and quest there fine).
I feel like this is an oversight if we can scale ourselves to a zone and quest/level there than we should also be getting wild pet battle character xp while in the zone we are chromie timed to.