Well, only four other persons (Other than me) reported the bug.

Of them, 2 said they were playing the cartridge on their GBA.

1 didn't give any indications. (He just said Interceptor was protecting all of his party at the same time =S)

The other plays on a ROM like me.

One of the two guys playing on the GBA and the other on the VBA both said Interceptor was protecting two members of their party, and then there's the guy saying the dog protects ALL the party.