Well, it depends on what Pokemon you are talking about. (Every Pokemon's HP is different.)
The HP of different Pokemon is different even at the same level. Even the same Pokemon may have more HP if it is trained rather than just caught from the wild.
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Depends on the pokemon.
arceus-my brother loves Pokemon and he answered it.also i think this is how u spell it------Correction: Blissey has the most hp out of all the Pokemon.
Giratina Lv.X Giratina lvl X has 130 HP sorry
If you use medicine it will level it up like calcium or what you want. you can also catch legendary Pokemon and they have very high defense and hp.
Bidoof evolves at level 15