Reference

Gen 3 type chart

Daily Red Pokemon uses Generation 3 rules: 17 types and no Fairy. Rows are the attacking move's type, columns are the defending Pokemon's type. Pick a type for its full matchup page.

Atk ↓ / Def →	Nor	Fir	Wat	Ele	Gra	Ice	Fig	Poi	Gro	Fly	Psy	Bug	Roc	Gho	Dra	Dar	Ste
Normal													½	0			½
Fire		½	½		2	2						2	½		½		2
Water		2	½		½				2				2		½
Electric			2	½	½				0	2					½
Grass		½	2		½			½	2	½		½	2		½		½
Ice		½	½		2	½			2	2					2		½
Fighting	2					2		½		½	½	½	2	0		2	2
Poison					2			½	½				½	½			0
Ground		2		2	½			2		0		½	2				2
Flying				½	2		2					2	½				½
Psychic							2	2			½					0	½
Bug		½			2		½	½		½	2			½		2	½
Rock		2				2	½		½	2		2					½
Ghost	0										2			2		½	½
Dragon															2		½
Dark							½				2			2		½	½
Steel		½	½	½		2							2				½

2 super effective · ½ not very effective · 0 no effect · blank is neutral.

What is different in Gen 3

Steel resists Ghost and Dark. Later generations removed these resistances.
Physical or special depends on the move's type. Normal, Fighting, Poison, Ground, Flying, Bug, Rock, Ghost, Steel are physical; Fire, Water, Electric, Grass, Ice, Psychic, Dragon, Dark are special.
There is no Fairy type, so Dragon has only Ice and Dragon moves to fear, and Steel resists Normal, Grass, Ice, Flying, Psychic, Bug, Rock, Ghost, Dragon, Dark, Steel.

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