one of my kids in my neighborhood said that every Pokemon can learn at least one ground type move is this true(yes I know about magikarp,ditto, and feebas)
If we follow Fondant's logic on learning Hidden Power allows you to use Hidden Power [Ground], then that just leaves Pokemon that cannot learn by TM, only by level up and Tutor.
No not true.
Source: I thought about that.(Then realized some Flying types can't learn Ground type attacks)