There are 8 different parnters in endless ocean. Rissos dolphin, common dolphin, bottle nose dolphin, false killer whale, commersons dolphin, white sided dolphin, orca and beluga whale.
There are not any dolphin fish that I know of.
Get the Medal in blue Hall.
no, but you can skip the Bottle Nosed Dolphin.
it is in one of the caves in the Abyss
To move the tree branch in endless ocean, you need to use the river dolphin. These can be seen in the temple in cortica river.
click A&B to make it look like your grabbing something
the grat drop off
go to the tools menu +, then press the food botton. shake the wii remote and you will be petting your dolphin.
To raise your dolphin's level in endless ocean, you simply have to work with it, teach it tricks, and feed it from time to time. It takes a LOT of time.(trust me I feel your pain.) Also, swimming with it wherever you go helps.
Eather false killer whale, or Rissios
Animal friends ? Well I made one where a Dolphin was trapped and I leaded it out.