If you are a juvenile Trainer who explores the Pokemon world degree-by-degree, then it is recommended to use this move for your first few battles, be it an unofficial battle or official. Don't fret about your Pokemon unable to learn it, for the first few Pokemon you'd be capturing and/or owning would already learn the move, as it is the common and cliche-est move a Trainer would use.
Although it is well-suggested to start with the basics, it is not a good idea to overuse the move when traveling continouously without Elixirs, Ethers, or Repels. Normal-type moves being very effective in type-matchup-based battles, you may want to save the move for stronger and type-effective opponents. Thus, in a way, making Tackle an intermediate type of move.