Used a Squirky instead of Terky...after using the Sporeling Sprout's strat, followed up with Stampede, Bubble, Stampede...then used a Grumpling and threw a Gift of Winter's Veil to finish Ruinhoof off...Squirky is relatively easy to get and so far has replaced Terky in two different fights successfully, if anyone is looking for a substitute :)
Boy, this guy hits hard! My Sporeling Sprout was only L23, but I wanted to level him up., so I backed him up with Terky per the strategy and Rotten Little Helper per Gotie's suggestion. I followed the strat detail with Sporeling and Terky (except I missed getting the Creeping Fungus on Ruinhoof in order to keep Sporeling alive). I then used Gotie's suggested moves with RLH, and Ruinhoof went down with the first Ice Lance. Thanks to everyone for the great suggestions and strategies.
I agree, Gotie. As I've said before (and elsewhere, and again, and again, till folks are tired of hearing it), if it's there, might as well take advantage of it.
Zylaura, I sympathize that it can be really disappointing to see the low XP given by some battles, especially after doing the really high-XP tamers, but every little bit helps. Using the lower-XP ones, as suggested by Gotie, on your near-L25s works very well.
Didn't have Terky leveld up so used Rotten Little Helper (2,2,1) instead.
Ice Lance till dead
had Anubisath Idol as 3rd but when he got in Ruinhoof had ~200 hp left and was stunned, so any humanoid will do here (could probably even use a lvl15+ pet to level ;) )