ITT: Moments you have where you realize or think you notice something smart or interesting built into the game's design. Whether intentional or not.

For example one of mine recently was realizing that in Generation 1 many of the pokemon in Cerulean Cave/Aka Unknown dungeon were there to help you catch mewtwo. Chansey for example was there to help you sponge Psychic attacks and had lightscreen for psychic, minimize to help you dodge mewtwo and stall for longer, defense curl to help live swifts. Electrode had light screen and could have been an emergency light screen if it outsped mewtwo at that level. We also had Hypno which was a pokemon resisting psychic that could put mewtwo to sleep, deal with mewtwos swift thanks to hypnos bulk, and lower mewtwos special attack with hypnos own psychic.

We even had a Kadabra you could immediately make into an Alakazam to fight Mewtwo later. Even the ditto had a purpose. What level was it? Like mid to late 60s. Close to Mewtwos level. If it was combined with the status inducing moves of other things you caught in the dungeon or for example light screen you would be able to transform into Mewtwo while that other Mewtwo was asleep or paralyzed. Or even if the Mewtwo decided to not use swift or psychic that turn you had a chance of using the ditto.