Here are all the Pokemon.
Ekans Arbok Seel Dewgong Dratini Dragonair Dragonite Seviper Feebas Milotic Gible Gabite Garchomp Axew Fraxure Haxorus Druddigon
All these Pokemon can breed with Feebas to get Iron Tail. Note that only the male can pass down moves.
Source
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