Pet Battle:  Highmountain
100% Hit Chance
Oozes onto the enemy, dealing 394 Magic damage.
Deals 197 Undead damage.
The user is healed for 100% of the damage dealt.
Spits Poison goo onto the target, dealing 98 Critter damage each round and increasing damage taken by 25% for 3 rounds.
Reduces up to 98.5 damage from each attack against you.
Lasts 5 rounds.
Submerges, becoming unattackable for one round.
On the next round, you attack, dealing 591 Aquatic damage.
Deals 591 Beast damage and has a 25% chance to stun the target.
Critters are immune to stun, root, and sleep effects.
50% from Beast abilities
33% from Elemental abilities
Trying not to be angry at the "I got one first try" posters, lol.
I've tried at least 80 Mudshells and never seen a Rare. Finally gave up and stoned one. And even Wowhead doesn't know yet what breeds there are but almost all my battles have been against B/B and just the occasional H/B.
No idea if it's just that the RNG gods hate me or that Blizzard having fun with pet tuning, but from experience does seem like the rarity tuned differently for different pets.
Found a rare first try. Highmountain 48,10 at Shipwreck Cove.