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>spiky shield is grass type only because of it originally being exclusive to chesnaught
>is still distributed to only chesnaught, cacturne and maractus
>nothing in its description specifies the spikes have anything to do with plants, doesn't specify thorns, is in no way depicted as a move that would be out of place on spiny non grass types like druddigon or skarmory
>even despite this ferrothorn, the grass type with thorn in its name, doesn't get it
It's like how megahorn is bug type purely because of it once being exclusive to heracross, yet the move itself has nothing to do with bugs.