Season of Ice Codes

Pause Startup: this is more of a GBA trick than a Spyro code.
Press + at the Gameboy startup screen and (Nintendo) disappears. It just sits there with Gameboy on the screen until you hit A,B or the directional pad.

Quick Start:
hold + + after you turn on the game.

Sleep Mode: at anytime you can put the game in sleep mode to save power.
+

All codes for this game are 8 directions (D-Pad) followed by the 'A' button when you hit the A button you should here a sound. You can then hit START to Play or enter more codes.

All Portals Open: From the "Press Start" screen

Unlock Warp ability: From the "Press Start" screen

Unlock Warp ability and all levels: From the "Press Start" screen

99 Lives for a new game: From the "Press Start" screen

Unlimited Health in Sparx Worlds: From the "Press Start" screen

Unlimited Weapons in Sparx Worlds: From the "Press Start" screen

Any weapon you pick up will be unlimited.

Choose Your Weapon in Sparx Worlds: From the "Press Start" screen

Use one of the following commands during game play in Sparx worlds:
Invincibility Shield: +
Smart Bomb: +
Wide Rapid Fire: +
Homing Bombs: +
All Keys: +

Unlock Dragonfly X*: From the "Press Start" screen

*You can learn this code in Season of Flame by listening to Yoric

99 lives for Sparx?: You may have seen a code to give you 99 lives in Sparx worlds. It's the same code as 99 lives for Spyro. Sparx has unlimited lives without using a code. I guess it's supposed to be some kind of joke.