Already charmed it and death leveling isn't an option anyway, it's a rainbow phoenix. It's already level 12 but I'm pretty impatient. I don't care about dire or anything, I just want it to 20. What is the fastest way? Someone suggest Horde mission to AFK farm but I stop getting experience. >-<
When I capped my polar bear during the GWEN preview event, it only took about a week of going about my usual business for it to become level 20. Once you quit thinking about it, it goes by faster than you think. Especially XP rich areas.
bring charm animal only, no comfort animal. 0 in beast mastery. bring it everywhere and let it die. it will still earn experience while dead, and you don't have to bother ressing it or using up attribute points.
sulfurous wastes. Nothing else. Drop into Junundu in Hard Mode and do the 10 minutes run with three heroes. it usually takes around 1.5-2h to powerlevel a pet from lvl 5 do lvl 20. It's not going to have any particular evolution type, but it will have the same stats as Elder evolution.