He does not. but Lombre does in level 49
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To my knowledge Ludicolo does not learn Hydropump, however, Lombre learns hydropump at level 49.
blastoise learns hydro pump at level 44
Samurott learns Hydro Pump at level 62.
Empoleon Learns Hydro Pump At level 59/ 99Lloyd99
blastoise learns hydro pump at 63