Just in case you're still looking for an answer, yes these are all fakes. An authentic Shellder has surfaced about a year or two ago, it's got some proof and history of legitimacy so we're not looking for that anymore, but your Shellder doesn't match the authentic one. Thanks to Undead and Goppier, stats for Sandshrew and Slowpoke are known as well but not IV or PID information, and yours don't match either.
The JEREMYs are all random wild catches in FRLG so they will need to match a wild encounter frame. The locations are known too, but because they're so low leveled there's no way to narrow down the possibilities without someone else sharing it to confirm.