Crobat Trick

The last post I wrote talked about how to get items from Lady Selphy. A good way to get a Crobat would be to keep on training a Golbat until it reaches max happiness. But there is a way that is much faster. After getting a few Luxury Balls from Selphy, go to Mt. Moon with a weak Pokemon like a Lv. 13 Pidgey. Find a Zubat, and use a weak move like Tackle on it until it reaches low health. Then, use a Luxury Ball to catch it. The Luxury Ball will make the Zubat grow happier quicker. Then, go to Vermilion City. Go to the field to the right of the city, and go in the building at the far right. go up the stairs, and talk to the man with the white clothes. He is one of Professor Oak's aides, and he has an Itemfinder to give to you. He will only give it to you if you have at least 30 Pokemon in your Pokedex. But if you already have the National Dex, you won't have to worry about that, because you need 60 Pokemon in your Pokedex to get the National Dex. So, get the Itemfinder, and Fly to Lavender Town. Go to the top of Pokemon Tower, and use the Itemfinder at the exact spot that Mr. Fugi was to get a Soothe Bell. It makes Pokemon grow happier faster. Make your Zubat hold it to make it become happier even faster. with a Luxury Ball and a Soothe Bell, the Zubat will grow to max happiness really quickly. The reason you should catch the Zubat at Mt. Moon is because Zubat evolves at Lv. 22. Leveling Pokemon up also makes them happier, and using Carbos for a super fast Crobat and Protein for Poison type attacks and Flying type attacks makes the Zubat better and happier.
Doing this makes any Pokemon grow happier 2.5 times faster
This is for Fire Red and Leaf Green only. I don't know if the Sevii Islands are in other games.