Pokémon Gold and Silver/Route 36-37

'The next two roads are short, but they lead in many directions and join several areas together. The tree you couldn't get past is still there, but this time you have the Squirtbottle from Goldenrod City. When the tree is gone, you'll finally be able to move on to the next area.'

Trade numbers for a Fire Stone
Elemental Stones are phenomenally rare, but junior trainer Alan doesn't have any problem finding them. After you beat him, give him your phone number, Eventually, he'll call and offer you a free Fire Stone, no strings attached!

Water (and capture) the Sudowoodo
Shortly before a tree in the middle of the path, you'll find the daughter of the Flower Shop woman in Goldenrod City. Talk to her, then head back to see her mom in Goldenrod City and get the Squirtbottle. Take that to the "tree" blocking the path and give it a squirt. When you use the Squirtbottle on the weird tree, it will attack you. It's not a tree at all—it's, a Rock-type Pokémon that looks like a tree! It's the only place that Sudowoodo shows up. Attack—capture it carefully, since if you K.O. it, it's gone for good.

EDIT: In Pokemon Crystal, even if you go get the daughter, you have to talk to the daughter from within the flower shop, and hear her say "If I beat Whitney, I wonder if she'll lend me her water bottle...", and THEN talk to the mom. Talk to the daughter BEFORE the mom to have her chuck it over.

More free stuff
The "tree" wasn't too popular, and the man to the right of it will give you TM 08 just for uprooting it. It contains Rock Smash, which breaks certain rocks that you'll soon encounter, and deals Fighting-type damage while lowering opponents' Defense in battle.

Three Apricorn Trees
The trees south of the entrance to Ecruteak City contain Red, Blue, and Black Apricorns, which can be made into Level, Lure, and Heavy balls by Kurt in Azalea Town. Like all Berries, they grow back every day.

Mr. Thursday and Mr. Sunday
Talk to Arthur, who appears above the Ruins of Alph on Thursdays, to get a Hard Stone, which powers up Rock attacks (go Sudowoodo!). Talk to Sunny below the Apricorn trees on Sunday for a Magnet, which beefs up Electric moves.

Pokémon found

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