Use electric moves on garaydos, ice on her dragonairs and dragon type moves on kingdra
First go to Goldenrod city.Then go down soon you will see a trainer. Last go right.Thank you,I hope you know now.
after you defeat trainer blue, the last gym leader in kanto, talk to prof. oak. he will give it to you
Garchomp go in the Pokemon league the last trainer of it.
In the pewter city museum. to get his attantion you must bring walking latias ( heartgold) or latios ( soulsilver ) with a soul dew from a mystery gift. then he will take you to saffron city. he will talk to you for a while. then he will go back to pewter then show you latios ( heartgold ) or latias ( soulsilver ) outside of the museum. then after you defeat or catch one of eon Pokemon that's the last of him.
In the first city
You need to do the last gym in kanto.
one berry
It's not the "last" Legendary Pokemon that you can find in Pokemon HeartGold, but most people usually catch that one last given that you need to have both Kyogre and Groudon in your party for Professor Oak to give you the Jade Orb to get to Rayquaza.
The last person (Cynthia) in the Pokemon league
The trainer in a Pokemon center it is a clown the last Pokemon he has is an Amipom.i think the clown is in heathome city no hes not in heart home but i don't know where he is
All you do is defeat another trainer using treecko as your last Pokemon so that he/she levels up. this should work. Make sure that he is not holding an evolution stopping item.
Lv 61, Feint.