Notes:
Fire
Water
Grass
Ice
Electric
Fighting
Ghost
Psychic
Poison
Steel
Bug
Rock
Ground
Flying
Dark
Normal
- Where a resistance has a corresponding super-effectiveness in reverse (e.g. for Fire's weakness Water there's Water's resistance to Fire, then the relationship is listed for one type only)
- One-sided weaknesses/resistances are represented in the same way which leaves room for ambiguity, but everyone reading this probably knows the chart off by heart
- Immunities treated the same as resistances because the difference between a 0 and 1/2 modifier when both reduce damage is pretty arbitrary
- Dragon not included because fuck dragon
Fire
- Melts Ice
- Melts Steel
- Sets Fire to Grass
- Roasts Bug
- Can't melt/burn Rock
- Fire already alight
Water
- Douses Fire
- Erodes Rock
- Turns Ground to mud
- Water already wet
- Not frozen by Ice due to high heat capacity
- Steel corroded by water on contact
Grass
- Grows through Ground
- Grows through Rock
- Soaks up Water
- Can't invade other Grass root networks
- Roots ground it against Electric
Ice
- Freeze-thaws Ground
- Frosts Grass
- Slows metabolism, Flying can't flap enough to stay aloft
- Ice already frozen
Electric
- Electrolyses Water
- Shocks Flying due to lack of grounding
- Resists Electric
- Steel gets shocked by electricity on contact
Fighting
- Bruises Normal
- Shatters Rock, Ice
- Bends Steel
- Not squeamish about Bug
Ghost
- Passes through Ghost, freaks out
- Spooks Psychic
- Normal goes through it
- Fighting goes through it
- Bug has nothing to feed on
- No flesh to Poison
Psychic
- Outsmarts Fighting
- Uses knowledge to neutralise Poison
- Matches own wits
Poison
- Poisons Grass
- Is toxic to Bug
- Contact poison deters Fighting
- Immunised against self
Steel
- Impermeable to Poison
- Harder than Rock
- Tougher than Normal
- Technology disproves Ghost
- Technology beats (Dark) magic
- Tin-foil hat effect against Psychic
- Grass can't grow roots into it
- Inedible to Bug
- Harder than Flying beaks/talons
- Hardened by Ice
- Steel can't cut itself
Bug
- Brings plague on Grass
- (Proportionally - see ants/rhinoceros beetles etc) Stronger than Fighting
- Triggers Psychic's OCD
- Can dig itself out of Ground
Rock
- Drops Flying out of the sky
- Crushes Bug
- Harder than Ice
- Tougher than Normal
- Impermeable to Poison
Ground
- Grounds Electric
- Buries Rock
- Binds with Poison
- Puts out Fire
- Turns Steel back to ore
Flying
- Eats Bug
- Eats Grass
- Can fly out of Fighting's reach
- Can fly out of Ground's reach
Dark
- Makes Psychic depressed
- Eats soul of Ghost
- Sensitive to beating from Fighting
Normal
- Can't see Ghost