Can we just discuss how underrated Steel is?
Steel type, when tied with the right second type, can make FLAWLESS Pokemon with incredible Resistance/Weakness ratios. Look at those of Metagross, Dialga, Magneton, Scizor, Empoleon, Bisharp, Heatran, etc. It is easily THE most underrated type, despite the fact that it is arguably the best type to have in terms of defense/resistance.
1. Dragon
2. Steel
3. Dark
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4. Water
5. Fire
6. Psychic