Pokémon Gold and Silver/Route 42

'''Route 42 connects Ecruteak City to Mahogany Town, and it also provides several entrances to Mt. Mortar. Keep your eyes peeled for the second entrance to the mountain, found on the stretch of road that's surrounded by two ponds—it's very easy to miss but very important!'''

Ignore the caves for now
You'll pass three entrances to as you cross Route 42, but you can't get to the caves' ultimate prize (an exclusive Pokémon) without HM 07 (Waterfall), so Mt. Mortar will be covered later on. For the time being, focus on reaching

Three rare Apricorn trees
You'll need to Cut your way into a private Apricorn grove along the middle of the route, but it's well worth it. It's the only place in the game where you can get Pink, Green, and Yellow Apricorns, which can be made into Love, Friend, and Moon Balls.

More headbutting fun
Remember when you Headbutted all those trees to get a and ? Well it's time to start Headbutting again, because starting with Route 42, there's a whole new assortment of Pokémon to dislodge. You'll get a lot of, but you'll also knock down new Pokémon and. If you've lost the Pokémon that knew how to Headbutt, you can re-buy the TM (#02) in Goldenrod City.

Pokémon found (Grass)

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Pokémon found (Water)

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