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random hc: missingno is the true horrible outcome of the incident's that occured on cinnabar. thats why it lives on the coast. dr. oak might have been part of the organization, maybe even partly in charge of it.
red realizes this but in the end is left traumatized by his encounter with missingno who is really a fucked up pokemon with messed up genes, suffering greatly but also spreading like a virus , soon to swallow kanto .
missingno basically moves and shapes around like the smoke monster from lost only that its made out of data glitches. it can take on various form and is lusting for revenge.
red doesnt speak due to his trauma and has basically lost his mind. mewto told him the true via psychic powers when they met at azulean cave.