EDIT: The guide is updated to E19! This means that the guide now contains spoilers for E19 content. Credit to @CosmanCosmin for creating their own updated version of the guide and helping with updates. You can find their guide here:
https://docs.google.com/spreadsheets/d/1lhsFND-Zc6vwquBpYmYODVOYHLhsuXvs1j8Gfu9It8k/edit?usp=sharing
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This is a list that shows at a quick look what different Pokemon are available at any given time in game in a monotype run.