Metrenome is one of my favorite moves. However, it isn't the best battle move so only get it for fun. Water Pulse is a decent move to get if you don't have a good water type Pokemon. Toxic is one of the best Stat moves you can get. Return is a useful move for Togetic to have, but not really for Togepi. Psychic or Extrasensory are a must to take care of fighting types. Shadow Ball is a move I am always glad to have, especially when facing Ghost types. Flamethrower is always useful. Shock Wave is a decent electric type attack because it doesn't miss. However power is only decent. Facade is a good choice for a Normal type because of STAB, or you could do Secret Power. Grass Knot is also a useful move. When you get a Togekiss, make sure to teach it Air Slash and Aura Sphere. Extremespeed is also good despite low PP.
I don't know why you ask, but a togepi can lurn Flamethrower, shadow ball, psychic and toxic if you teach him tms.