You get it as a reward for collecting all the Chaos Emeralds.
Collect 50 rings and either double jump (2.1.25 or older) or jump and press the spin key (2.2.0 and up) depending on the version you have.
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Here is a cheat code for Sonic Robo Blast 2. Open the game menu and enter god to gain invincibility.
poda paty
Sonic Robo Blast 2 is a fan-made game by STJr (sonic team junior.) The current version is 2.0.4 download it at http://www.srb2.org click download and go on from there.
You have to beat the whole game of srb2 without an cheats
to turn it on open system/console and say GR_MD2 ON and to turn off do the same but say off instead of on