It is in Viridian City, behind the Poke Center.
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Lance
i do but it is meganium but i breed it for chikorita
That's not ash its trainer red although he's based off from Pokemon yellow.
the only way is to trade Pokemon with both games. Hope i helped from trainer idiot.
In Heartgold and Soulsilver, the House of Memories is in Lavender Town, which is in Kanto, East of Saffron City.