Giant Tidepool Dragon as Monstrous Mount
Arcana, Diplomacy, Intimidate, or Handle Animal 5 ranks; Ride 5 ranks.
Size Small; Speed 10 ft., fly 30 ft., swim 60 ft. (average; unable to carry a rider while flying or swimming); AC +3 natural armor; Attack bite (1d4); Ability Scores Str 15, Dex 11, Con 17, Int 8, Wis 14, Cha 14; Languages Common, Draconic; Special Qualities darkvision 60 ft., low-light vision, amphibious.
Size Medium; Speed 20 ft., fly 60 ft., swim 70 ft. (average; unable to carry a rider while flying or swimming); AC +2 natural armor; Attack bite (1d6); Ability Scores Str +4, Dex -2, Con +2.
Spell-Like Abilities (CL equal to HD)
3/day—tail strike, aqueous orb
4/day—slipstream, dousing rain, whispering wind, elemental speech
7/day—hydraulic push, obscuring mist, strong wings (self only), enlarge person (self only, the normal targeting restrictions of the spell do not apply)
at will—acid splash, dancing lights, detect poison, mage hand, touch of fatigue (DC 12)
Mastery (7th Level)
The Giant Tidepool Dragon can carry a rider while flying or swimming, but reduces its fly or swim speed by half while doing so.