You can't because you might not have a Walk Through Walls cheat/Tweaking glitch.
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LT. Surge has a level 28 Raichu and that's it.
after beating lt. surge, you ll get it with thunderbadge
After you've beaten all the previous gym leaders(Brock, Misty, Lt. Surge, and Koga), and have obtained the tea from celadon, you can fight Sabrina, whose gym is in Saffron. Your Pokemon should be lv.'s 40+.
talk to fishermen. you can get an old rod in the city with LT surge
Bulbasaur: a house in Cerulean City after defeating Lt. Surge Charmander: a boy north of Nugget Bridge Squirtle: Officer Jenny in Vermilion City after defeating Lt. Surge