Normally having gaps in your memory is a bad thing, but in the case of blayzeon's sometimes-faulty memory? It's pure entertainment.
You can see that in action in this Pokemon project, where blayzeon drew up all the original 151 Pokemon from memory—which we've seen before—but this time, there was no erasing. Whatever was drawn out in the first go is what the Pokemon gets to look like. Lookie here:
Granted, while some of these are (hilariously) off, most of them are still vaguely close, right? If not kind of cute. There's more, too. Here's second-gen Pokemon, drawn from memory without erasing:
Pretty fantastic. You can follow blayzeon's work here.