They are not in Pokemon HeartGold
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In "Pokemon Shipwreck" James admitted he liked Jessie, but she seemed to have more important things to do then have a crush on James. In the manga, Jessie and James are married and Jessie is pregnant.
Jessie has had poison and bug types, while James has had poison, grass and psychic types.
they can't be better because Jessie, James and Meowth are part of the main characters in Pokemon
they are both 17, according to the Pokemon wiki
There is no best Pokemon on Pokemon HeartGold.