It's the met level that's causing the problem. Your met level is 47, Palkia learns Heal Block at 50 in Pearl. Change the met level to 50 or greater and it'll be reported as legal. See attached file.
484 ★ - Palkia - 73B12D3A8108.pk7
You uploaded a generation 7 Pokemon (.pk7). For Palkia to have learned Heal Block, it must have done so in generation 4. Which means it must have been at least level 50 when it was transferred to generation 7.
The TID/SID combo look fine in RNGReporter.