Completed a gen 4 living Dex incl mythicals
Currently fulfilling a childhood wish of completing the Pokédex in every mainline Pokémon game. Just finished gen 4 and got a full living Dex in Platinum. I've also completed all the national dexes in Diamond, Pearl, HeartGold & SoulSilver.
For Platinum and assembling the main living Dex pictured - this was nowhere near as tedious as finishing gen 3's living dex with the amount of games needed there (all 5 main games + GameCube games). Every Pokémon that could be obtained in Platinum was caught in game for this living Dex (including a legit Honey Tree Munchlax). The remainder were traded in from other gen 4 games.
After completing Platinum's living Dex, I worked on completing the dexes in the other 4 gen 4 games. I really wish there was a Pokémon Box equivalent for this gen. It would've made things so much easier!
It took a long time transferring Pokémon up from gen 3 (where I had completed living Dexes for each regional Dex in RS FRLG), thanks to the stupid 6 Pokémon per 24 hours limit. This was for the Kanto and Hoenn sections in Diamond & Pearl. Some Johto Pokémon were transferred up while others were from HGSS. All Sinnoh Pokémon were obtained in both Diamond & Pearl, alongside in Platinum for the main living Dex. This helped complete the DP dexes.
After finishing the transfers up, some Hoenn & Sinnoh Pokémon were touched traded from DP to HGSS to register the Dex entries. Combined with completing Johto living dexes there, this helped complete the Dex in those 2 games.
Fortunately, all the legendaries could be obtained within the 5 gen 4 games for the main Platinum living Dex, once I obtained the event Regigigas. Thankfully I was able to get the unobtainable mythicals using the DNS exploit, as I sadly was never able to get these as a kid back in the day.
Aside from the DNS exploit (which I don't really consider cheating), no cheats were used at all for completing these dexes and assembling the Platinum living Dex.
The platinum living Dex will stay in that game. Onto gen 5 next. It's been a while since I played a Unova game, so I'm really looking forward to it!