Enter a link battle with something that can Mega Evolve, trigger the Mega Evolution then select a move. The games will hang indefinitely on the Link standby message. Also, if two Pokemon capable of Mega Evolving are out at the same time, only one will get the Mega Evolution trigger to pop up.
Link Battles are relevant because Hamachi allows online battling on Gen III.
Enter a link battle with something that can Mega Evolve, trigger the Mega Evolution then select a move. The games will hang indefinitely on the Link standby message. Also, if two Pokemon capable of Mega Evolving are out at the same time, only one will get the Mega Evolution trigger to pop up.
Link Battles are relevant because Hamachi allows online battling on Gen III.