[...ah Metronome. He knows that move.]

Sounds like you've just got crappy luck. Metronome picks any move at random.

As for Togepi, seeing as how mine's grown up a lot and that's still the only offensive one he's learned by himself... Ahh, if you weren't new around here, I'd say buy a TM like Water Pulse and teach it to yours so she could at least reliably defend herself, but you probably won't be able to do that for a while, huh.