I'm a bit upset that inverse wasnt even considered. Think of how it could have allowed creature more switch in and out survival to have a resistance to rocks and fire (SR included.) Sure, the trade is weaknesses to ground and ice, both common types, but with the power to switch around, it'd have had viability with choice items.
Intimidate seems a poor choice to me. It'll get one or two uses at most with that ability. The second use may kill it if it switches in on SR, provided Intimidate's Mechanism lets it go before SR faints it.