>>37082835You can catch a Mareep in a patch of grass just south of the city with the first gym, it’s one of my favourite electric types ever. Only downsides to using it is it trades speed for bulk and it’s a really common Pokemon to use in the Johto games, every person I know uses one on their team.
You can also catch a Zubat in Dark Cave, it’s really weak at first but acrobat is a really cool Pokemon.
If you can trade with another game, you can catch Geodude on that optional route north of the first route. You can also get Gastly in the Sprout Tower if it’s night time.