I'll try to put as much as details on the characters from movie 2

Here's the list

Ash

Pikachu

Ash's Snorlax

Ash's Charizard

Ash's Squirtle

Ash's Bulbasaur

Ash's Lapras

Misty

Misty's Golden

Misty's Staryu

Misty's Togepi

Tracey Sketchit

Tracey's Scyther

Tracey's Marill

Tracey's Venonat

Jessie

Jessie's Arbok

James

James' Weezing

Meowth

Melody
a young shrine maiden who lives on Shamuti Island. She takes a liking to Ash. she owns a aerodynamic boat. She plays Lugia's song when the 3 sapphires are placed in the shrine.

Lawrence III
A pokemon collector. He attempt to capture the 3 birds to bring Lugia. He did bring Lugia but in the end he failed. He owns a lot of treasures he stole or got.

Carol - Melody's older sister.

Maren
Is the captain that drives the boat. She was the one who help Ash and his gang to Shamuti island and Fire sland.

The Elder
The ruler of Shamuti island.

The Reporter
We see the reporter and the cameraman fallowing Professor Oak and Icy to Shamuti island

Lugia

Arcticuno

Zapdos

Moltres

Slowking

Professor Oak

Professor Ivy

Delia

Brock

Delia's Mr. Mime


I hope that help! :D

oh yeah there's a lot of wild pokemon. And other characters but I don't know who they are....there was no names either sorries even in their japanese name.