waiting for shedninja
todays my break through if i wait till tmr to open it will i be unable to any more field researches?
Answers
Yes, you will not be able to claim any research rewards until you open the box, which in turn locks in the box reward pokemon.
But I would advice you to open it now. Shedninja is all but guaranteed to be a completely irrelevant dex entry, Suicune on the other hand is a strong pokemon in the main series that could also become useful in POGO if the battle system changes. Post-rebalance it's the 8th tankiest mon in the game, the tankiest water type by a fair margin and tankier than any non-legendary except for the trio of fat normals. None of this tankiness is relevant as long as they don't allow legendaries to defend gyms, but the meta in POGO was not always DPS-centric, it favored TDO for the first 11 months. It's entirely possible we will see an eventual shift back to TDO or new game modes to provide use for both high DPS and high TDO pokemon.
tl;dr Suicune has more potential than Shedninja.