Steven and his friend denis must have encountered the genesect (artificially created) and tried to beat it. they ended up losing, and denis died. So after you beat Steven in the ruins, he must be hilucinating when he says he thought you were a Genesect.
Try to hit the other Pokemon from behind. Try not to be stressed
talk to your first party Pokemon behind you.
It is in Viridian City, behind the Poke Center.
The lady behind the counter in the underground tunnel in goldenrod city.
She is in the house behind prof oak's lab in pallet town.
You can get into that door by hacking it or activating a cheat on it
No, the mechanics behind IVs and EVs have not changed in Pokémon HeartGold and SoulSilver, they have remained the same as they were in Pokémon Platinum.
Try to hit the other Pokemon from behind. Try not to be stressed
If you mean they will be behind you throughout the game, then no, they won't. The only games that allowed Pokemon to follow behind for the adventure were Pokemon HeartGold and SoulSilver. In Pokemon Diamond, Pearl, and Platinum, you can go to the Amity Square, which is connected to Hearthome City, where certain chosen Pokemon can follow you for that area, however.
behind your pokemons
talk to your first party Pokemon behind you.
if by left behind you mean put in the PC, nothing. whatever Pokemon is first in your party follows you
in the dragons den. its in blackthorn behind the gym.
It is in Viridian City, behind the Poke Center.
you have to get a lot of badges the more badges the higher the level of Pokemon will obey you. If you mean physically follow you around on the screen, it's not possible UNLESS you go to the park in hearthome city, where only "cute" Pokemon can follow you around a restricted area. HeartGold and SoulSilver are the only games where you can have Pokemon follow you everywhere.
On the water in the dragons den behind the blackthorn city gym.
The lady behind the counter in the underground tunnel in goldenrod city.