Pokemon heartgold team help

im statring a new game on heartgold and im thinking my team will be

typhlosion
starmie
ampharos
donphan
dragonite
heracross

plz tell me if i should change anything and give me movesets

I would consider swapping Starmie for something like Vaporeon or, if you can get your hands on it, Milotic. Both of them are still pure water types, and both of them can take a few good hits before needing a potion or switching out while still doing some respectable damage on their own. Your team focuses a lot on speed and power. While that can be a useful strategy, nearly all of them are easily taken care of in one blow. Typhlosion, Dragonite, and Ampharos are weak to rock and ground type moves; both of which are fairly common. Heracross goes down easily to fire, which is also fairly common. Vaporeon and Milotic can soak those hits a lot better than Starmie can.

If you want to go with Vaporeon, I'd recommend something like this:

-Toxic
-Acid Armor
-Wish
-Baton Pass

Toxic can be replaced with Surf (or Ice Beam if you really need an ice move), but three Acid Armors would be a pain to break. Pile that on with Wish to restore HP and then Baton Pass to an injured Pokemon that can still take a hit on the switch, and you've got yourself a great defensive utility to work with. Toxic is mainly to deal secondary damage while Vaporeon tanks whatever it's up against, but as I said you can use Surf for STAB or Ice Beam if you need some extra oomph for Lance. I'm not a big fan of Ampharos or Typhlosion, so I'm not going to be of much help there. Dragonite is a very fun Pokemon with a lot of viable options to work with. Heracross and Donphan are a bit more limited in their moves, but they're both still pretty fun. I can help you out a little better if I know what you're trying to go for. Are you just trying to get through the game or do you want to play on WiFi after the campaign is finished?

Im going to play wifi after i finish the campaign

i will keep donphan

should i replace heracross with anything?

nahh im not that big of a fan of fighting types.

i was thinking maybe espeon?