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Thanks! That's solved! It helped me a lot

Mankey and Bulbasaur do not exist in Legends Arceus, so you can not convert them. Same with Onix which does not exist in Scarlet. Mankey exists in Brilliant Diamond, so that one works. Starting with Gen 8 GameFreak decided to cut some Pokemon out of the games. They don't even have data/models for those. Some Pokemon might get added through DLCs while others will remain unavailable.

That’s great!! Thank you so very much ill rest assured

As @Kaphotics said, Gen4 save files are 512KB, not 1MB. So there could be some issues in your flashcart/emulator settings. I trimmed the extra 512KB and it works (I also added a Pichu-Color-Pikachu in your Box 2, so you can directly use it to trigger the Spiky Eared Pichu event). Pro tip: you can use TWiLight Menu++, a DSi menu replacement, also with flashcarts. In this way you can have the best DS roms compatibility. Take a look here. 4781 - Pokemon SoulSilver (U)(Xenophobia).sav

Gen4 save files are 512KB, not 1MB.

Checkpoint works like a charm with all Pokémon DS/3DS carts, HGSS included.