Pokemon Ashgrey POC got Magikarp earlier in a random encounter than the POC guide says it could?

Pokemon Ashgrey POC got Magikarp earlier in a random encounter than the POC guide says it could?

I was running back and forth from the lake where you jump in to get to viridian city from Pallet Town (went back to catch all the pokemon there). One time while in the lake i randomly got a Magikarp encounter while walking in it. I guess it makes sense since in the first episode there were magikarp in the lake where Ash stole Misty's bike. The POC guide doesn't mention a magikarp any earlier than the Lt. Surge part however. Did i get an extremely rare encounter or something and is the guide wrong about this?

https://preview.redd.it/6qxjbcng2k5h1.png?width=1152&format=png&auto=webp&s=d11c59e2faed2564b02787096f63766ef5f66af5

https://preview.redd.it/6bwh5dkh2k5h1.png?width=1152&format=png&auto=webp&s=3a85aa8de6c764477770f5212dbb34506e5f71a9

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u/Hoorn34 — 5 days ago