Pokemon Red/Blue High Level Pokemon And Duplicating Items Glitches

Those of you who have one of the first Pokemon games might be having a hard time completing their Pokedex or need Pokemon so strong, they exceed the level limit of 100. Well, here's how.
To get Pokemon over level 100: Requirements- Thunderbadge; Soulbadge; HM FLY; HM SURF; Surfing Pokemon like Nidoking, Blastoise, Snorlax, etc.; Flying Pokemon like Pidgeot, Pidgeotto, etc.; Access to Cinnabar Island or Fuschia City. First, fly to Viridian City. Then, talk to the man who demonstrates to you how to catch Pokemon. When he asks you if you're in a hurry, say no. After he captures the Weedle, immediatley fly to Cinnabar Island. If you want to, fly to Fuschia City instead. If you flew to Cinnabar Island, Surf up and down the right(as in, opposite of left right, not opposite of wrong) side of the island where your character is half on land and half in water. The first time, you might find a Tentacool if you're really unlucky. Depending on your character's name you might find different Pokemon. My character's name is ASH, for instance, so I found mostly level 128 Golbats, but occasionally, I found some level 141 and 154 Snorlaxes, and very rarley in Cinnabar, some level 80 and 148 Missingno.s. Missingno. is a glitch Pokemon and has either a really quick female Nidoran's cry, the cry of a Dratini, or, if you look at its stats, the cry of a Rhydon. For me, when it was in my party, instead of looking like a fish, snake, or cow, it looked like a person who is also in some places, a trainer. And instead of moving its head or arms up and down, it turns into something that looks a little like a healing machine in a Pokemon Center. If you flew to Fuschia City instead, Surf south, then west until you get to the Seafoam Islands. Surf up and down the coast of Seafoam where your character is half on land and half in the water. Here, you have a higher chance of finding lots of Missingno. If you find a Missingno, try to make sure that the item in the 6th slot of your bag is not a key item. Some good things to put in the 6th slot would be a Masterball, Rare Candies, and Nuggets. Good thing happen to the item in the 6th slot of your bag if you find and run away from or defeat a Missingno. Pretty much what I just said is that if you put an item in the 6th slot of your bag then find and defeat or run away from a Missingno., your item will be duplicated so much, the number might look something like part of a Pidgey, then a number next to that. After using your item so many times, it may go down to 0 then 99 instead of 0 to picture 9.