Ps2 in Android is imposible at the moment. If you need gc emulation gpd win is even cheaper than 500 bucks, and os better emulates than on android. Dolphin in Android is still worse than windows builds. Mario sunshine , wind waker or Mario kart are easy to emulate. But try emiuating metroid Prime for instance. Even the shield tv with la GPU struggles with many gc titles. The fact that some games are playable on android doesn't mean all gc is fullspeed.