Scala implicitly. Where to override it?

ImplicitTest.scala

package snippet

/**
  * Created by walidus on 27/06/17. How to override the implicit val with c?
  */
object ImplicitTest extends App{
  implicit val overrider = MyClass.c // works
  Util.print()
}
object Util {
  def print() = {
    implicitly[Gen[MyClass]].printSomething // autogenerated code, assume you can not change it
  }
}

class Gen[T](str: String) {
  // bad place //implicit val overrider = MyClass.c
  def printSomething = println(str)
}

case class MyClass()

object MyClass {
  implicit val b = new Gen[MyClass]("MyClass") // this we want to override
  val c = new Gen[MyClass]("overriden MyClass") // this is what we want use instead for minority of useage
}
// MyClass and package object have to be in separate files
package object snippet {
  // too big scope //implicit val overrider = MyClass.c 
}