Hatch the Ethereal egg you pick. Skip the spawn hunt.
Black Hole, Cherub, Solaris, Volcanic: choose one of the four Ethereal eggs in Ride A Pet, type your Roblox username and watch it hatch.
The mount it gives shows with the game's own odds.
Solaris Egg3 of 4
What you skip
Every Ethereal egg in the map has to be tracked, found and carried before it breaks. Here is that run, then this one.

-- the long way
buy the Eternal Radar
30,000,000 in-game cash. It follows Black Hole, Solaris and Cherub, never Volcanic.
ride to the Giant Tree, the Waterfall Cave, the Desert Pyramid
Volcanic waits in the Dragon's Lair on Volcano Island. You check spot after spot.
carry the egg home
15 to 30 seconds before it breaks, 20 for a Solaris.
-- this way
pick Black Hole, Cherub, Solaris or Volcanic
The egg is yours to choose before anything starts.
type your Roblox username
The hatcher finds the account.
hatch
A short countdown, then the mount: Griffin, Dragon, Kitsune or Cerberus.
pass one security check
The mount drops in that player's nest.
Do and don't
Do
Type the username from your Roblox profile, the name after the @.
Don't
Type your display name. Display names can repeat.
Do
Give the username and pick the egg. That is all the hatcher needs.
Don't
Send a password or a login code. Nobody here asks that.
What we know, what we don't
Known
There are four Ethereal eggs: Black Hole, Cherub, Solaris and Volcanic.
The mount is a Griffin, Dragon, Kitsune or Cerberus, with the game's odds beside it.
Open
Which of the four mounts your egg gives: that is settled at the hatch.
Whether the odds favour you: the hatcher displays them, it never changes them.
Your Ethereal egg is one pick away
Choose it, type your username, watch the countdown.
Hatch my Ethereal egg