Patterns Pokémon Ruby/Sapphire/Emerald exemplifies

Pattern	How RSE uses it
loadout-as-budget	At two grains: (a) the 4-move moveset per Pokémon — 4 slots, hundreds of options, type-tagged — the smallest-grain canonical budget in this knowledge base; (b) the 510 EVs across 6 stats per Pokémon — 252 cap per stat forces ~2-stat focus.
bonus-with-drawback	Natures (+10% one stat / −10% another, 25 fixed grid). Choice items (+50% Attack but locked to one move). Macho Brace (2× EV gain, halved Speed). Toxic Orb / Flame Orb (badly poisons / burns the holder, but enables Guts / Quick Feet / Poison Heal abilities). The pattern is most-built-out here of any game in the knowledge base.
late-introduced-mechanics	Battle Frontier opens post-credits (~25h in). Contests require travelling to Verdanturf or Slateport. National Dex unlocks only after beating the game + completing Hoenn Dex + talking to Birch. Trade-only evolutions are gated by social interaction.
type-rps-matrix	The 17-type chart with dual-type multiplication. The canonical instance of asymmetric N-way RPS in commercial games — referenced and rebuilt in countless monster-collectors since.
permanent-stat-profile	Each Pokémon has a fixed Nature + Ability + IVs (0–31 per stat) set at capture. Profile is largely immutable; the Pokémon you have is the Pokémon you have. This drives the breeding / re-rolling competitive subloop.
version-exclusive-trade-gate	Ruby and Sapphire have asymmetric encounter pools, antagonist-team prominence, and mascot legendary. Trade is required to complete the Pokédex. The trade requirement is the social loop.
third-version-canonical-merge	Emerald is the canonical edition of Hoenn — merges the two antagonist teams' arcs, makes Rayquaza the mascot, replaces Battle Tower with Battle Frontier, animates sprites. Sold as a separate $30 cartridge ~22 months after R/S.
post-game-challenge-tower	Battle Frontier — 7 facilities, each with its own ruleset (Tournament, Rentals, Auto-Pilot, Score-Judged, Roguelike Pyramid, Random-Door Pike, Standard Tower). 14 Symbols total. The blueprint for every Pokémon endgame since.
weather-as-global-modifier	Drought / Drizzle / Sand Stream as abilities that summon permanent weather. Weather boosts and weakens specific types and triggers ability interactions (Chlorophyll +Speed in sun, Swift Swim +Speed in rain). The basis of three full generations of "Weather Wars" competitive play.
parallel-meta-system	Contests, Secret Bases, Berry growing — three independent progression systems that don't feed the badge / level main loop. Each has its own currency, judges, and completion arc. The franchise's first attempt at "more verbs alongside the main loop."
flavor-as-meta-narrative	Every move has a battle role AND a contest category — the same 4-slot moveset is read two ways (combat-effective vs presentation). Soft thematic richness for free.