I restarted my White a couple of days ago. Chose Oshawott, then dumped him straight away for a male Pidove. After getting the C Gear I went through the tedious process of catching/trading slightly over two boxes of Pokémon (my collection of bird shinies, a few misc shinies/random L100's and 15 eggs). The eggs had all been brought to the 'sounds can be heard inside' message and once I got them all hatched I had L1 versions of all the unobtainable birds in Unova.
Lastly, I was able to transfer Tornadus Therian over from the Dream Radar.
I haven't bothered to explore any of the areas fully so I'm going quite quickly. Just defeated Burgh which surprisingly enough, was quite easy.
My current team:
Crackle (Murkrow L27)
Echo (Staravia L26)
Attara (Tranquill L26)
Whisper (Natu L21)
Majesty (Swanna L100)
I didn't realise how awful Natu/Xatu's level up movepool was, so she will be rotated out soon. Swanna is there because he knows Surf. I made sure to transfer my three Lucky Eggs over along with all my Pokémon so those plus Audino is making levelling easy as anything.
Not entirely sure how I'm going to get past Elesa yet. Nor looking forward to running into things like the Roggenrola line, where I'm not going to be able to OHKO them regardless. I plan to add Skarmory for a bit of bulk and I'm making myself continue on through Dream Radar to get my hands on Regenerator Ho-oh. Fun times.
Thanks for a great 15 years, Pokémon.