[dafier]

From lvl 4 to 49, I did my best to keep my research up to speed or purchase every water pet.

I had all focus items, and your best bet for xp is find a necro or mage (pet class) to group with and let your pets wreck everything while your small group gets 100%xp split.

Water pet + DS and BO when you get it is absolutely the best way to go.

At 50 to 56 you should use MS2. Simply put that pet is OP! No, it doesn't root, no it doesn't nuke, but it hits really good (max level pet) and has the same amount of HP as the 57 earth pet. Throw BO3/4, muzzle and DS on it and kick back to watch the show. Again, group to get full xp benefit.