Pokemon: Radical Redux - Chapter 115: Oak has dementia

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

Because of his own carelessness, Duanmuhuai crossed into the world of the game “Xinghai OL”. Starting from a small core cabin, Duanmuhuai crossed the galaxy, traveled to countless worlds, awakened the power that had long been dormant, and fought against the hidden depths of the universe. The threat to dominate the galaxy!

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- Description from novelbuddy

The person that Pei Zhen hates most in his life is the perfect Fu Sichen. Alas, life is full of surprises and unpredictability. One fine day, an accident turns Pei Zhen into Fu Sichen’s pet cat! As Fu Sichen’s pet cat, he makes a shocking discovery about his sworn enemy – a deep dark secret that the perfect Fu Sichen has kept hidden for years. Trapped in his cat body, Pei Zhen moves from one adventure into another while trying hard to find a way of turning back into his human self. When he finally does, the world as he once knew, has become a completely different place!

Alex, An average guy transmigrates to an ancient world. He awakens an ability to farm in an interdimensional pocket space.Far from what he imagined, the planet he was on was completely different from the earth he knew. There were mythical beings, magical abilities and powerful civilizations. All that contradicts his common sense.Let's watch how he survives the harsh unknown world with his wits and extraordinary ability.