Number 75 in the Heart Gold pokedex is Politoed ^_^
Graveler is #75 in the national pokedex, and it is a Rock-Ground type Pokemon.
the #75 sinnoh pokedex entery is honchcrow. The evolved form of murkrow you can evolve murkrow with a dusk stone.
You get a ticket to sinnoh and and pokedex entries are expanded
Chikorita is #152, and it is a starter Pokemon you can choose from in Gold, Silver, Crystal, HeartGold, and SoulSilver.
i believe your answer is the pokedex
Honchkrow, the evolution of Murkrow.
you have to trade them over
you can't
Dunsparce and Mareep
Fill up the rest of your Pokedex!
Ok now the best thing i suggest you do is: on wiki, if you were trying to find number 75 for example, you would send a question in asking what Pokemon number 75 is and where you can find it. Do that and I'm sure your pokedex will be complete in no time! Hope this helped = )
youhave to beat the johto league