It does not learn it by leveling up. For Totodile to know Ice Punch in HeartGold, one of its parents used to produce its egg must be Abomasnow.
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At Level 76
Level 56.
not, you will need to use tm80, rock slide, on onix.
it will learn it at level 36
at level 1 but u need to go to the fat move tutor with heart scale. it wont work for me :(