If you have no other use for TMs Rhydon will be the better counter and cost no or less dust. I however have a major TM drought and could use at least 10 of each but usually get 1 per week with 1-2 raids a day. I wont be using them on Rhydons for the following reasons:
Various (non SE) mons that are better counters to raikou or many other opponents where rhydon is usefull.
In gen 4 rhydon can evolve to rhyperion so im not gonna waste precious TMs on a mon that will be further evolved.
