You’ll get TM69 Rock Polish from Sage Bronius towards the end of Chargestone Cave. Sage Bronius is one of 6 Sages you’re asked to find after the main story, which means this TM is only obtainable in the post-game.
The easiest way to reach Sage Bronius is by starting at the exit of Chargestone Cave, which is located in Mistralton City. Once you find the Sage, you’re challenged by two Team Plasma goons. After defeating Team Plasma, Bronius will hand over TM69 Rock Polish.
As for the move itself:
Rock Polish is a Status move that increases the user’s Speed stat by two stages, doubling the stat. The move can be used three times for a total increase of six stages.
TM69 Rock Polish Location (Step-by-Step)
Step 1: Starting at the Mistralton City Pokémon Center, head south to reach the entrance (or exit) of Chargestone Cave.
Step 2: After entering the cave, head west over the small set of stairs.
Step 3: Continue left until you come across a four-way intersection in the cave. From here, head north.
Step 4: Directly ahead is a staircase on the left that leads to the lower floor. Climb down these stairs.
Step 5: After entering the lower floor, continue down the next staircase straight ahead (also on the left-hand side of the room).
Step 6: In the next room, head south down the available path.
Step 7: Directly ahead is a floating crystal blocking the path. Push this crystal to the right, and then you can continue south through the path.
Step 8: You’ll need to veer southeast past the large rock formations a bit, although you’ll still mostly be going south.
Then head down the stairs you’ll find next to the NPC with teal hair.
Step 9: From the bottom of these stairs, walk south down the narrow path.
Step 10: Continue south to reach Sage Bronius at the end of the path.
Step 11: Speak with Sage Bronius to start a small dialogue.
But unlike the other Sages you’ll come across in the post-game, Team Plasma will ambush you with a battle. So you’ll need to battle the two Team Plasma grunts before getting your TM.
Step 12: After defeating the two Team Plasma members, Sage Bronius will give you TM69 Rock Polish.
Rock Polish Details + Uses
|Rock Polish Move Details|
Rock Polish is a powerful Rock-type move that increases the user’s Speed stat by two stages.
With just one use of this move in battle, a Pokémon’s Speed will double. This can create a great advantage for your Rock-type Pokémon, which is a type that typically suffers from lower Speed.
Below is a chart that outlines the stages of how the Speed stat increases:
Rock Polish is best taught to a Rock-type with strong Attack and mediocre Speed.
Some great Rock Polish users in Pokémon Black/White include:
All four of the Pokémon above can learn the move via TM. And while Rock Polish is teachable to mostly just Rock-types, there are some exceptions where other typings can learn this move as well.
For example, the Ghost/Ground-type Golurk and the Dark/Steel-type Bisharp can both learn the move, and they both fit the bill as strong attackers with low Speed.