I heard that its cry is possibly endless. I, however, am not so sure. I need a second opinion.
♀ . doesn't have an endless cry, but it can occasionally cause endless unrelated noises that will freeze the game.
[The glitch Pokemon] can also replace the battle music with never-ending glitchy sounds that don't allow its cry (which is identical to Raticate's) to play, effectively locking up the game.
♀ . (Bulbapedia)
It is possibly endless and it could be in a loop here is the source http://bulbapedia.bulbagarden.net/wiki/♀_.