Best place to grind in Pokémon blue before Elite Four?

Question

I’m doing a Pokemon blue nuzlocke rn on my 2ds and I want to get my Pokémon to at least lv 60 or 70 before facing the elite four and my rival. Does anyone have any advice for grinding?
Here’s my team and their level
Pog- electrode lv 39
Benedict- exeggcutor lv 42
Shroom- parasect lv 39
Jester- vaporeon lv 44
Dusty- sandslash lv 42
Dazzle- moltres lv 50

Comments

Drop Electrode and Parasect from your team so more experience can go to your other Pokemon, and then just keep battling the Elite 4 until you get enough experience to win

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@sumwun this is a Nuzlocke

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I cannot literacy.
If this is a Nuzlocke, I think you should first battle all regular trainers you haven't battled yet, and then grind wherever the wild Pokemon give you the most experience (which is probably Victory Road).