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Of the 39 Missingno. most of them have undefined cries, and the cry data for these variations are usually 0 base (Nidoran♂), pitch 0 and length 256 cries. However, nine Missingno. index numbers notably use different cries (thanks IIMarckus for originally documenting them). In this video I show the index numbers of these Pokémon with the codes 01xx1ED1 and 01xx1DD1 which let you view any Pokémon in the Pokédex and show its index number.

The base stats data for Missingno. and its starting moves are garbage data. To find a Pokémon's base stats, the game searches data from the ROM address 0x0383DE + (PkmnNo. - 1) * 0x1C; and when the game uses 0, the game adds 0xFF. 0x03C546 is in the middle roster data for Bikers, following on from the end of roster no. 08. See Stag019's "Missingno. explained" article for more information on this. In other languages and Pokémon Yellow different offsets are used for different data partly explaining the regional differences in glitch Pokémon in terms of base stats, starting moves, etc.

Pokémon cries on the other hand are stored following on in order for each index number, starting at 0x39446 in Red/Blue and 0x39462 in Yellow. (thanks ThomasWinwood for the offsets) The Pokémon cries are defined here (base cry, pitch, length) and the game does not point elsewhere suggesting that the special Missingno. cries may have once been defined intentionally. The cries are also consistent between versions. One highlight is the last Missingno. (index number 181) besides the ones reserved for fossil sprites. It uses a cry very similar to Crobat, though not identical to Crobat's cry in Gold/Silver which used a different base cry. Pokémon Gold and Silver also added an echo feature to many of its cries, including Crobat.