I don't think you can get one but if it is possible i woulld have to say in a special deliery service like schoolastic at home
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Buy a Pokemon pokedex hand-book and look under #201
Recto is the right hand page of an open book
It boosts the partner of the Pokemon who used helping hand. In other words, it makes you stronger and increases your stats. :)
In the book that I read there are 836 pages
There is no Ghost Pokémon that can learn Helping Hand.