Is there any other way to get a Tails chao in SA2B other than connecting a Game Boy Adv. to Phantasy Star Online for GameCube and meeting a Tails chao in Phantasy Star Online and sending it to a GBA with no cartridge?
If there is it hasn't been discovered yet. But given how much work is needed to be done in order to get the Tails chao, it probably is the only way to get one.

~Ron