The threadstarter did mention about zapping, under "LAB TRAINING" section,
"All amazing huh except for the lower part. Also Train your pet above level 20 before using lab because you MIGHT get zapped back to level 1 if your pets level is under 20."
As for the Faerie abilities, it matters.
For poor brokes like me, spending 3 codestones to level once is quite a pain. Especially if they're Eo Codestones....