Where do i get the secret potion in Pokemon Pearl?

Answer 1

go to the valour lake front and go south to the beach an then if you go north you should get to a hotel (if not go to the beach an keep goin right) and use your poketech app (the radar thingy)to look for the womans suite key give it to her an she gives u a lava cookie then go to the safari park in pastoria city don't actually go in but heal your Pokemon then talk to the galactic member just to the right of it u should hear him speaking then he will run off follow him then you will fight your friend (whatever you named him), as long as you've got 25+ levelled Pokemon an a good mix (e.g. a water a fire a grass... etc.) once you've beaten him follow the grunt again he runs off to the lake stoppping every so often to think ...aloud... and then you speak to him and he will run off again do that about 3-5 times an finally will battle you just at the lake u should beat him then he hobbles off and you see Cynthia standing in front of those 2 people in black guarding the lake speak to her and she will give you the secretpotion!