From GuildWiki

Rainbow Phoenix
Classification
Species: Animal Profession: Pet Level(s): 5

The Rainbow Phoenix is a charmable animal found in the Hall of Monuments.

Location

• Far Shiverpeaks
  • Hall of Monuments

Notes

A full-grown Rainbow Phoenix

• The Rainbow Phoenix will only appear in the Hall of Monuments when the following conditions are met:
  • No one else is in your party, including heroes and henchmen.
  • All four tapestries have been displayed.
  • One of the following:
    • The character has achieved the rank of "People Know Me (2)" in the Kind Of A Big Deal title track.
    • The character has achieved the rank of "Kind Of A Big Deal (1)" in the Kind Of A Big Deal title track and has a "full" Hall of Monuments in personal or account-wide view.
• After being unlocked, the Rainbow Phoenix will only appear in the Zaishen Menagerie Grounds if no one else is in your party.
• The Rainbow Phoenix is the largest pet available in Guild Wars. For this reason, it is sometimes preferred in PvP over other pets, as it can be distracting.
• This is the only pet that cannot be death leveled or charmed by a hero, because it only appears when the player is alone and in areas without resurrection shrines.
• The Rainbow Phoenix deals piercing damage.
• The Rainbow Phoenix is one of four pets that appear to fly when they move.

Historical note: For a short time after the 4th Anniversary Update that introduced the Zaishen Menagerie, there was a bug that made it possible for heroes to charm this pet. The bug was quickly fixed, and all Rainbow Phoenixes on heroes were removed.

Animal companions (Evolving • Charming/Finding)
Tyrian	Albino Rat • Black Bear • Black Wolf • Dune Lizard • Iguana • Jingle Bear • Lynx • Melandru's Stalker • Moa Bird/Strider • Mountain Eagle Polar Bear • Rainbow Phoenix • Raven • Warthog • White Crab • White Jingle Moa • White Moa • White Wolf • Wolf/Snow Wolf
Canthan	Black Moa • Crane • Lurker • Phoenix • Reef Lurker • Tiger • White Tiger
Elonian	Crocodile • Flamingo • Hyena • Jahai Rat • Lion • Lioness • Warthog
Exotic	Black Widow • Moss Spider